CVE-2026-22045

Aliases:GHSA-cwjm-3f7h-9hwqGO-2026-4322
Advisory lineage Upstream: 0 Downstream: 3
Analyzed
Published: 15 Jan 2026, 22:44
Last modified:20 Jan 2026, 16:29

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

15 Jan 2026, 22:44
Published
Vulnerability first disclosed
20 Jan 2026, 16:29
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Techniques & Countermeasures

  • CWE-770•Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

  • github.com/traefik•traefik

    all

  • github.com/traefik/traefik•v2

    < 2.11.35

  • github.com/traefik/traefik•v3

    < 3.6.7

  • traefik•traefik

    ≥ 3.0.0-beta1, < 3.6.7 | < 2.11.35 | ≥ 3.0.0, < 3.6.7

References (6)