CVE-2026-22045

HIGH EPSS 23.9%
Published Jan 15, 20265mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jan 15, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
23.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-770

Affected Products 2

VendorProductVersionRange
traefiktraefik* <2.11.35
traefiktraefik*≥3.0.0  –  <3.6.7

References 4

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

Remediation

  • github.com https://github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26c3d
    Patch
  • github.com https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwq
    PatchVendor Advisory