Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.35 and 3.6.7, there is a potential vulnerability in Traefik ACME TLS certificates' automatic generation: the ACME TLS-ALPN fast path can allow unauthenticated clients to tie up go routines and file descriptors indefinitely when the ACME TLS challenge is enabled. A malicious client can open many connections, send a minimal ClientHello with acme-tls/1, then stop responding, leading to denial of service of the entry point. The vulnerability is fixed in 2.11.35 and 3.6.7.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | < 2.11.35 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26cPatch
- https://github.com/traefik/traefik/releases/tag/v2.11.35Release Notes
- https://github.com/traefik/traefik/releases/tag/v3.6.7Release Notes
- https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwqPatchVendor Advisory
FAQ
What is CVE-2026-22045?
CVE-2026-22045 is a vulnerability with a CVSS score of 5.9 (MEDIUM). Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.35 and 3.6.7, there is a potential vulnerability in Traefik ACME TLS certificates' automatic generation: the ACME TLS-ALPN fast path c...
How severe is CVE-2026-22045?
CVE-2026-22045 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-22045?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.