GO-2026-6441

    Dashboard / Vulnerabilities / GO-2026-6441

    GO-2026-6441

    Published: 15 Sept 2026Last Modified: 15 Sept 2026

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

    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.

    References: https://github.com/grpc/grpc-go/security/advisories/GHSA-qc2q-p7wx-3px3, https://github.com/grpc/grpc-go/pull/9332

    Affected packages

    Package

    Name: google.golang.org/grpc

    Purl: pkg:golang/google.golang.org/grpc

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -1.83.1

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High