Is CVE-2026-119574 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-119574?

CVE-2026-119574 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-119574

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.