Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification (CVE-2026-87004) | HOL Guard CVE

High · CVSS 8.1CVE-2026-87004

Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification

Answer in brief

CVE-2026-87004 records a High severity (CVSS 8.1) vulnerability in Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification. The current sources do not mark it as known exploited. The current feed maps Quenary/tugtainer (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 Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.1. 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 Quenary/tugtainer (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Quenary/tugtainergeneric	<1.31.3	1.31.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for Quenary/tugtainer.
Review the reported fix. Update Quenary/tugtainer to 1.31.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source description

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider's token endpoint using jose.jwt.get_unverified_claims() instead of jwt.decode(). This skips signature verification, audience (aud) validation, issuer (iss) validation, and expiry (exp) checking entirely. The extracted claims (email/sub/preferred_username) are then used directly as the user_id for the resulting Tugtainer session. This issue has been patched in version 1.31.3.

Quoted source text, attributed separately from HOL analysis.