CVE-2026-41174: traefik · Incorrect Authorization
Affects traefikSource GCVE Database
Not known to be exploited · CVSS 4.8 Medium : upgrade to 3.7.0-rc.2 or 2.11.43 when convenient.
Data as of 27 Oct 2026, 01:16 UTC
- Patch
- Available – fixed in 3.7.0-rc.2, 2.11.43
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 30 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade traefik to 3.7.0-rc.2 or 2.11.43.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| traefik traefik | Affected
| Fixed in
|
AI-suggested
This vulnerability has been patched in Traefik versions 2.11.43, 3.6.14, and 3.7.0-rc.2. Users should upgrade to one of these versions or later to remediate the issue. No additional mitigation steps are indicated beyond applying the official fix.
Description
CVE-2026-41174 is an authorization vulnerability in Traefik's Kubernetes CRD provider prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2. When cross-namespace middleware references are disallowed, Traefik correctly blocks direct references but fails to enforce this restriction for middleware nested inside a Chain middleware. This allows an actor with permission to create or update Traefik CRDs in their own namespace to bypass namespace isolation and apply middleware from other namespaces. The issue is patched in the specified fixed versions.
References
- github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq (opens in a new tab)
- github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d (opens in a new tab)
- github.com/traefik/traefik/releases/tag/v2.11.43 (opens in a new tab)
- github.com/traefik/traefik/releases/tag/v3.6.14 (opens in a new tab)
- github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 (opens in a new tab)