Critical severity9.8NVD Advisory· Published Sep 4, 2026· Updated Oct 8, 2026
CVE-2026-85595
CVE-2026-85595
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.
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Affected products
1Patches
Vulnerability mechanics
References
2- github.com/traefik/traefik/security/advisories/GHSA-5w68-77r2-r64cnvdExploitMitigationPatchVendor Advisory
- www.vulncheck.com/advisories/traefik-before-2.11.55-authentication-bypass-via-digestauthnvdThird Party Advisory
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