CVE-2026-22045
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Traefik
PublishedJan 15, 2026
First seenJan 15, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- traefik traefik2.11.35, 3.6.7 or later
- github.com/traefik/traefik/v33.6.7 or later
- github.com/traefik/traefik/v22.11.35 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| traefik traefik | v < 2.11.35, 3.0.0 ≤ v < 3.6.7 | 2.11.35, 3.6.7 |
| github.com/traefik/traefik/v3Go | v < 3.6.7 | 3.6.7 |
| github.com/traefik/traefik/v2Go | v < 2.11.35 | 2.11.35 |
| github.com/traefik/traefikGo | No range specified | — |
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