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CVE-2026-22045

Traefik's ACME TLS-ALPN fast path lacks timeouts and close on handshake stall

Published: Jan 15, 2026Updated: Jan 23, 2026 Sources: CVE List NVD GHSACWE-770
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.3%
Top 76.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

traefiktraefik
On-prem
Networking Infrastructure / load-balancer-proxy
github.com/traefik/traefik/v3GoOSS Libraries
github.com/traefik/traefik/v2GoOSS Libraries
traefikoss-projectNetworking Infrastructureaka traefik enterprise
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26c3d
github.com
https://github.com/traefik/traefik/releases/tag/v2.11.35
github.com
https://github.com/traefik/traefik/releases/tag/v3.6.7
github.com
and 3 more references View all →

Timeline

Published
Jan 15, 2026
Last Updated
Jan 23, 2026

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