CVE-2026-119574

MediumCVSS 5.9/10Last modified Nov 3, 2026

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 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-567

Affected software

No affected versions have been published.

Timeline

Published: Oct 30, 2026
Last modified: Nov 3, 2026
NVD status: Analyzed

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