CVE-2026-88012

Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded

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

traefik

CVSS v3.1 GITHUB

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

0.52% chance of exploitation in the next 30 days, 43rd percentile

Published

2026-09-10

Updated

2026-09-11

Proof-of-concept exploits (1)

• advisories/GHSA-7ghq-v6jf-g56c

Security advisories

• traefik/traefik/security/advisories/GHSA-7ghq-v6jf-g56c
• traefik/traefik/pull/13717

References

• CVE Record
• NVD entry