CVE-2026-88012: Traefik

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream deadline. An unauthenticated client can use a slow request body, trickling data indefinitely while holding a request and an upstream connection open and exhausting backends with bounded connection pools. This issue is fixed in 2.11.56 and 3.7.12.

Affected products

• Traefik Traefik: from 2.8.2, before 2.11.56 (fixed in 2.11.56); from 3.0.0, before 3.7.12 (fixed in 3.7.12)

Published 2026-09-10. Last modified 2026-09-14.