CVE-2026-88878 PUBLISHED

Traefik v2.8.2 through v3.6 HTTP/3 Timeout Bypass

Assigner: VulnCheck
Reserved: 10.09.2026 Published: 10.09.2026 Updated: 10.09.2026

Traefik is an HTTP reverse proxy and load balancer. In versions >= v2.8.2 through <= v2.11.55 and >= v3.0.0 through <= v3.7.11, the entryPoints.<name>.transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying TCP connection, which cannot be applied to a QUIC stream, and Traefik's HTTP/3 server is constructed without any timeout. As a result, on entry points with HTTP/3 enabled, an unauthenticated remote client that trickles request body bytes can hold a request open indefinitely and, with it, one upstream connection per request, exhausting bounded backend connection pools and causing denial of service. The issue was introduced in v2.8.2 when a quic-go API change removed the embedded http.Server that carried these timeouts. Fixed in v2.11.56 and v3.7.12.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 6.9

Product Status

Vendor traefik
Product traefik
Versions Default: unaffected
  • affected from 2.8.2 to 3.7.13 (incl.)
Vendor traefik
Product traefik
Versions Default: unaffected
  • affected from 3.0.0 to 3.7.13 (incl.)

Credits

  • ShadMalloy reporter

References

Problem Types

  • Allocation of Resources Without Limits or Throttling CWE