CVE-2026-22045

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.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security-advisories@github.com

Published

2026-01-15

Last modified

2026-01-20

Weaknesses

CWE-770

Affected products

• Traefik (Traefik)

References

• https://github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26c3d
• https://github.com/traefik/traefik/releases/tag/v2.11.35
• https://github.com/traefik/traefik/releases/tag/v3.6.7
• https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwq