CVE-2026-22045
January 15, 2026
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.
Affected Packages
https://github.com/traefik/traefik.git (GITHUB):
Affected version(s) >=v3.0.0-beta1 <v3.6.7Fix Suggestion:
Update to version v3.6.7https://github.com/traefik/traefik.git (GITHUB):
Affected version(s) >=v1.0.alpha.157 <v2.11.35Fix Suggestion:
Update to version v2.11.35github.com/traefik/traefik/v3 (GO):
Affected version(s) >=v3.0.0-beta2.0.20230203142405-044dc6a221a1 <v3.6.7Fix Suggestion:
Update to version v3.6.7github.com/traefik/traefik/v2 (GO):
Affected version(s) >=v2.0.0-rc1 <v2.11.35Fix Suggestion:
Update to version v2.11.35Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.02
