CVE-2026-119574
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Oct 30, 2026
Vendor
unknown
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.