Traefik before v2.11.55 Authentication Bypass via digestAuth (CVE-2026-85595) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-85595

Traefik before v2.11.55 Authentication Bypass via digestAuth

Answer in brief

CVE-2026-85595 records a Unknown severity vulnerability in Traefik before v2.11.55 Authentication Bypass via digestAuth. The current sources do not mark it as known exploited. The current feed maps traefik/traefik (generic), traefik/traefik (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 4, 2026Updated Sep 4, 2026Source checked Sep 4, 2026First seen by HOL Sep 4, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 traefik/traefik (generic), traefik/traefik (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
traefik/traefikgeneric	>=0 <2.11.55	2.11.55
traefik/traefikgeneric	3.0.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for traefik/traefik, traefik/traefik.
Review the reported fix. Update traefik/traefik to 2.11.55 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 4, 2026

Sources and claim methodology

Upstream source description

Traefik versions before v2.11.55 contain an authentication bypass vulnerability in the digestAuth middleware where unknown usernames receive an empty secret instead of rejection. Attackers can compute a valid digest response using the empty secret and arbitrary credentials to bypass authentication on any digestAuth-protected route without a valid username or password.

Quoted source text, attributed separately from HOL analysis.