CVE-2026-85595

critical · 9.3

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.

9.3

CVSS

0.7%

EPSS (exploit prob.)

53rd

EPSS percentile

2026-09-04

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-287

Affected products

Vendor	Product	Affected versions
traefik	traefik	< 2.11.55
traefik	traefik	>= 3.0.0, < 3.7.11

Check a specific version with /api/v1/cve/match.

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-85595