CVE-2026-119574
Medium · 5.9CVSS
5.9
EPSS
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Published
Oct 30, 2026
CISA due date
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The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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