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VULNERABILITIES

CVE-2026-119574 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/traefik/traefik/security/advisories/GHSA-ww7c-q3mv-xx22 [email protected]PatchVendor Advisory
https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.15-fastproxy-data-race-denial-of-service [email protected]Third Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-567Unsynchronized Access to Shared Data in a Multithreaded Context[email protected]

Affected Products

ProductVersions
traefik traefik
>= 3.2.0, < 3.7.15

CPE

  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-119574
NVD Published Date:
Oct 30, 2026
NVD Last Modified:
Nov 3, 2026
Source:
[email protected]
CVE-2026-119574 Details - Not Deferred