Description
Traefik from 3.2.0 before 3.7.15 contains a data race in the experimental FastProxy that allows unauthenticated attackers to crash the process by abusing HTTP/1 protocol upgrades. Attackers can repeatedly open and abort upgraded connections such as WebSocket, corrupting the unsynchronized shared bufio.Reader and triggering an unrecovered panic that terminates Traefik.
Published: 2026-10-30
Score: 8.2 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Fri, 06 Nov 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-366
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 30 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 30 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Description Traefik from 3.2.0 before 3.7.15 contains a data race in the experimental FastProxy that allows unauthenticated attackers to crash the process by abusing HTTP/1 protocol upgrades. Attackers can repeatedly open and abort upgraded connections such as WebSocket, corrupting the unsynchronized shared bufio.Reader and triggering an unrecovered panic that terminates Traefik.
Title Traefik 3.2.0 before 3.7.15 FastProxy Data Race Denial of Service
First Time appeared Traefik
Traefik traefik
Weaknesses CWE-567
CPEs cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Vendors & Products Traefik
Traefik traefik
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-30T15:17:13.625Z

Reserved: 2026-10-30T10:56:15.489Z

Link: CVE-2026-119574

cve-icon Vulnrichment

Updated: 2026-10-30T15:17:09.339Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-30T14:16:46.453

Modified: 2026-11-03T14:04:16.240

Link: CVE-2026-119574

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-30T13:18:12Z

Links: CVE-2026-119574 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-06T02:30:14Z

Weaknesses
  • CWE-366

    Race Condition within a Thread

  • CWE-567

    Unsynchronized Access to Shared Data in a Multithreaded Context