CVE-2026-85595

EUVD-2026-71018
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
9.3 CRITICAL
NETWORK
LOW
NONE
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
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
traefiktraefik
𝑥
< 2.11.55
CNA
traefiktraefik
3.0.0 ≤
𝑥
≤ 3.7.12
CNA
Common Weakness Enumeration
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