7.5

CVE-2026-22045: Traefik's ACME TLS-ALPN fast path lacks timeouts and close on handshake stall

Analyzed
AliasesCGA-2wf9-rpgv-vw9jCGA-q94w-vxjq-r2f3CGA-rcg4-c75m-w9f9
Published 15-01-2026Last modified 20-01-2026

Vulnerability summary

CVE-2026-22045 is a high (CVSS 7.5) vulnerability in traefik. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 27.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.34%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 5
OPENSUSE-SU-2026:10142-1OPENSUSE-SU-2026:10143-1OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0292-1CGA-V4V3-R58Q-GFRM

Timeline

  1. 15-01-2026
    PublishedVulnerability first disclosed.
  2. 20-01-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.35% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard3 products
  • traefik-3.4All versions (No fix recorded)
  • traefik-3.5All versions (No fix recorded)
  • traefik-fips-3.5All versions (No fix recorded)
Github.com/traefik/traefik2 products
  • v2< 2.11.35
  • v3< 3.6.7
Github.com/traefik1 product
  • traefikAll versions (No fix recorded)
Traefik1 product
  • traefik≥ 3.0.0-beta1, < 3.6.7 | < 2.11.35 | ≥ 3.0.0, < 3.6.7
Wolfi1 product
  • traefik-3.4All versions (No fix recorded)

5 vendors · 8 products

References

7 links