gRPC-Go: xDS RBAC and HTTP/2 Vulnerabilities

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N · score source

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Multiple security vulnerabilities have been identified and addressed in grpc-go affecting the xDS RBAC authorization engine (internal/xds/rbac) and the HTTP/2 transport server implementation (internal/transport). These vulnerabilities could result in: - Authorization Bypass (Fail-Open) when translating xDS RBAC policies containing Metadata or RequestedServerName fields. - Denial of Service (High CPU Consumption) due to an HTTP/2 Rapid Reset mitigation bypass during client-initiated stream resets. - Denial of Service (Server Panic) when parsing crafted xDS RBAC policies containing NOT rules around unsupported fields. Impact What kind of vulnerability is it? Who is impacted? xDS RBAC Authorization Bypass via Metadata & RequestedServerName matchers - Affected Component: xDS RBAC - Impact: When building policy matchers for gRPC RBAC from xDS configurations, unsupported permission and principal rules (specifically Metadata and RequestedServerName) were silently ignored and treated as…

Published by the source

27 Jul 2026, 15:30 UTC

Last modified by the source

28 Jul 2026, 15:15 UTC

Source last checked

26 Oct 2026, 15:27 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-hrxh-6v49-42gf

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GO-2026-6061

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# Patch Next advisory brief: GHSA-hrxh-6v49-42gf

Advisory: gRPC-Go: xDS RBAC and HTTP/2 Vulnerabilities
IDs: GHSA-hrxh-6v49-42gf
Record: https://patchnext.com/advisories/go-2026-6061 (revision 3, source checked 26 Oct 2026, 15:27 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: google.golang.org/grpc 1.82.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go google.golang.org/grpc: affected < 1.82.1; fixed in 1.82.1

## Suggested inspection (read-only)
- Go google.golang.org/grpc: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on google.golang.org/grpc.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GO-2026-6061 (OSV record GO-2026-6061 lists affected ranges: Go google.golang.org/grpc >=0 <1.82.1 (fixed))
- Verified: https://github.com/advisories/GHSA-hrxh-6v49-42gf (GitHub-reviewed advisory GHSA-hrxh-6v49-42gf lists affected ranges: Go google.golang.org/grpc >=0 <1.82.1)

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