CVE-2026-85595
Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 4, 2026
- Updated
- Oct 8, 2026
- Reserved
- Sep 4, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | VulnCheck |
Weaknesses
- CWE-287 Improper Authentication
Affected Products
| Product | Versions |
|---|---|
traefiktraefik |
|
traefiktraefik |
|
References
- GitHub Security Advisory (GHSA-5w68-77r2-r64c)vendor-advisory
- VulnCheck Advisory: Traefik before v2.11.55 Authentication Bypass via digestAuththird-party-advisory
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