Traefik versions before v2.11.55 and versions v3.0.0 through v3.7.10 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.
Fix
Public exploits 1
- Boreas37/CVE-2026-85595-PoC PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
Patch, vendor advisory and mitigation references on NVD 1
- https://github.com/traefik/traefik/security/advisories/GHSA-5w68-77r2-r64c Exploit, Mitigation, Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 9.3 · traefikNVD modified 2026-10-08 16:17
Affected (CPE criteria) 1
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
References 2
- https://github.com/traefik/traefik/security/advisories/GHSA-5w68-77r2-r64c Exploit, Mitigation, Patch, Vendor Advisory
- https://www.vulncheck.com/advisories/traefik-before-2.11.55-authentication-bypass-via-digestauth Third Party Advisory