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.
Advisories

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Fixes

Solution

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Workaround

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History

Fri, 04 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 04 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
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.
Title Traefik before v2.11.55 Authentication Bypass via digestAuth
First Time appeared Traefik
Traefik traefik
Weaknesses CWE-287
CPEs cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Vendors & Products Traefik
Traefik traefik
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-04T13:56:38.491Z

Reserved: 2026-09-04T10:59:00.162Z

Link: CVE-2026-85595

cve-icon Vulnrichment

Updated: 2026-09-04T13:56:18.601Z

cve-icon NVD

Status : Received

Published: 2026-09-04T12:17:22.960

Modified: 2026-09-04T14:17:22.983

Link: CVE-2026-85595

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-04T13:15:06Z

Weaknesses