CVE-2026-85595: traefik traefik

CVSS 9.8 (critical) · published 2026-09-04

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.

Affected products (NVD): traefik traefik

Fixed in (NVD): 2.11.55, 3.7.11

Weakness: CWE-287

Source: NVD CVE-2026-85595

References

• https://github.com/traefik/traefik/security/advisories/GHSA-5w68-77r2-r64c
• https://www.vulncheck.com/advisories/traefik-before-2.11.55-authentication-bypass-via-digestauth

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