CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-22045
High (7.5) in traefik traefik. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/traefik/traefik/v3 3.6.7.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
- CWE
- CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-cwjm-3f7h-9hwq | Go | github.com/traefik/traefik/v3 | <3.6.7 | 3.6.7 |
| GHSA-cwjm-3f7h-9hwq | Go | github.com/traefik/traefik/v2 | <2.11.35 | 2.11.35 |
| GO-2026-4322 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-4322 | Go | github.com/traefik/traefik/v2 | <2.11.35 | 2.11.35 |
| GO-2026-4322 | Go | github.com/traefik/traefik/v3 | <3.6.7 | 3.6.7 |