CVE-2026-85595
published 2026-09-04CVE-2026-85595: 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…
PriorityP268critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.69%
52.3th percentile
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
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| devspaces | traefik-rhel9 | — | — |
| traefik | traefik | < 2.11.55 | 2.11.55 |
| traefik | traefik | >= 3.0.0 < 3.7.11 | 3.7.11 |
| traefik | traefik | 3.0.0 – 3.7.10 | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.09.3CRITICALCVSS: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
vendor_redhat9.3CRITICAL
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VulDB
Traefik up to 2.11.54 digestAuth middleware improper authentication
vuldb·2026-09-06·CVSS 9.3
CVE-2026-85595 [CRITICAL] Traefik up to 2.11.54 digestAuth middleware improper authentication
A vulnerability described as critical has been identified in Traefik up to 2.11.54. Affected is an unknown function of the component digestAuth middleware. The manipulation results in improper authentication.
This vulnerability is known as CVE-2026-85595. It is possible to launch the attack remotely. No exploit is available.
Upgrading the affected component is recommended.
GHSA
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.
ghsa_unreviewed·2026-09-04
CVE-2026-85595 [CRITICAL] CWE-287 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.
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.
Red Hat
github.com/traefik/traefik: Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
vendor_redhat·2026-09-04·CVSS 9.3
CVE-2026-85595 [CRITICAL] CWE-305 github.com/traefik/traefik: Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
github.com/traefik/traefik: Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
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.
An authentication bypass vulnerability was discovered in Traefik's digestAuth middleware. When an incoming request contains a username that does not exist in the configured authentication store, the application fails to reject the request and instead evaluates the credential
No detection rules found.
No public exploits indexed.
2026-09-04
Published