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  4. CVE 2026 115539 cluster api proxy overwrites forwarded client
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Back to active CVEs
High · CVSS 7.7CVE-2026-115539

Cluster-API proxy overwrites forwarded client identity with its ownCVE-2026-115539

Answer in brief

CVE-2026-115539 records a High severity (CVSS 7.7) vulnerability in Cluster-API proxy overwrites forwarded client identity with its own. The current sources do not mark it as known exploited. The current feed maps Docker/Docker Engine (generic), moby/Moby (generic), moby/SwarmKit (generic), moby/SwarmKit (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.7
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Docker/Docker Engine (generic), moby/Moby (generic), moby/SwarmKit (generic), moby/SwarmKit (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Docker/Docker Enginegeneric>=23.0.0 <**
moby/Mobygeneric>=0 <=2.0.0-beta.28Not reported
moby/SwarmKitgeneric>=0 <2.1.32.1.3
moby/SwarmKitgeneric>=1.12.1-0.20220307221335-616e8db4c3b0 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Docker/Docker Engine, moby/Moby, moby/SwarmKit.
  2. 2Review the reported fix. Source-reported solution: Upgrade applications using github.com/moby/swarmkit/v2 to version 2.1.3 or later.

Evidence timeline and material changes

  1. Published upstream

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 10, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source description

SwarmKit's Cluster-API proxy can overwrite a forwarded client's TLS identity with an intermediary manager's identity. WithMetadataForwardTLSInfo replaces outgoing metadata with a copy of the incoming metadata, discarding the redirect guard's changes when built with grpc-go 1.39 or later. During a short window after a leader change, two proxy hops through managers with inconsistent views of the leader can allow an attacker possessing a valid worker node TLS certificate and private key to obtain a manager node certificate for the attacker's own key, escalating privileges from worker to manager. Applications built with an affected SwarmKit version and grpc-go 1.39 or later are impacted.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-441
Source
CVE List V5
Source checked
Nov 10, 2026
References
1 linked source
Open source record