Denial of Service Vulnerability in Traefik HTTP Reverse Proxy by Traefik Labs
CVE-2026-22045

5.9MEDIUM

Key Information:

Vendor

Traefik

Status
Traefik
Vendor
CVE Published:
15 January 2026

What is CVE-2026-22045?

A vulnerability in Traefik, an HTTP reverse proxy and load balancer, allows unauthenticated clients to exploit the ACME TLS challenge mechanism. By sending minimal ClientHello requests with acme-tls/1 and then ceasing to respond, an attacker can cause resource exhaustion by tying up Goroutines and file descriptors indefinitely. This can lead to a significant denial of service, affecting the availability of the entry point. The issue has been addressed in Traefik versions 2.11.35 and 3.6.7.

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Deploy the Patch

Affected Version(s)

traefik < 2.11.35 < 2.11.35

traefik >=3.0.0-beta1, < 3.6.7 < 3.0.0-beta1, 3.6.7

References

https://github.com/traefik/traefik/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/traefik/traefik/commit/e9f3089e9045812...
x_refsource_MISC
https://github.com/traefik/traefik/releases/tag/v2.11.35
x_refsource_MISC

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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