CVE-2026-22045 MEDIUM

CVE-2026-22045: Traefik's ACME TLS-ALPN fast path lacks timeouts and close on handshake stall

Vendor Traefik
Product traefik
Weakness CWE-770 · Uncontrolled resource consumption
Published January 15, 2026
Last update January 20, 2026
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 15, 2026 CVE published
January 20, 2026 Record updated