CVE-2026-22045
Last modified
CVE-2026-22045 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.32% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | < 2.11.35 |
| Traefik | Traefik | >= 3.0.0, < 3.6.7 |
References
- https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwqPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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