CVE-2026-22045Network attack vector

Unauthenticated service interruption via stalled TLS handshake

Published Jan 15, 2026 · Updated Jan 15, 2026

Resource exhaustion in Traefik Proxy 2.11.34 and earlier and 3.0.0-beta1 through 3.6.6 allows remote attackers to interrupt entrypoints. In pkg/server/router/tcp/router.go, the ACME TLS-ALPN branch clears existing deadlines, then performs a TLS handshake without a timeout or server-side close. When the ACME TLS challenge is enabled and allowACMEByPass is disabled, each stalled unauthenticated connection retains a goroutine and file descriptor until the entrypoint is exhausted.

CVSS severity5.9
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Traefik Proxy 2.11.34 and earlier and 3.0.0-beta1 through 3.6.6 allows remote attackers to interrupt entrypoints. In pkg/server/router/tcp/router.go, the ACME TLS-ALPN branch clears existing deadlines, then performs a TLS handshake without a timeout or server-side close. When the ACME TLS challenge is enabled and allowACMEByPass is disabled, each stalled unauthenticated connection retains a goroutine and file descriptor until the entrypoint is exhausted.

The record

CVE
CVE-2026-22045
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Traefik Labs
Product
Traefik Proxy
Classifications
CWE-400, CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.11.35
  2. Affected versionversion=>=3.0.0-beta1, < 3.6.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Traefik Labs · Traefik Proxyversion=< 2.11.35; version=>=3.0.0-beta1, < 3.6.7

Published CVSS scores

5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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