CVE-2026-119574: traefik traefik

CVSS 8.2 (high) · published 2026-10-30

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.

Affected products (NVD): traefik traefik

Fixed in (NVD): 3.7.15

Weakness: CWE-567

Source: NVD CVE-2026-119574

References

• https://github.com/traefik/traefik/security/advisories/GHSA-ww7c-q3mv-xx22
• https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.15-fastproxy-data-race-denial-of-service

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.