Resource exhaustion in Traefik
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (25.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Traefik — versions < 2.11.35, >=3.0.0-beta1, < 3.6.7
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwq (Patch, Vendor Advisory)
- github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26c3d (Patch)
- github.com/traefik/traefik/releases/tag/v2.11.35 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.6.7 (Release Notes)
Frequently asked questions
- What is CVE-2026-22045?
- CVE-2026-22045 is a medium-severity vulnerability in Traefik, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.9/10. Published 2026-01-15.
- How severe is CVE-2026-22045?
- Medium severity. CVSS v3 base score is 5.9 out of 10.