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Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M

CVE-2026-88012Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded

Medium 5.3

In plain English

A medium-severity resource allocation without limits in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 55.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/traefik/traefikno fix listedGO-2026-6454
Gogithub.com/traefik/traefik/v22.11.56GHSA-7ghq-v6jf-g56c
Gogithub.com/traefik/traefik/v22.11.56GO-2026-6454
Gogithub.com/traefik/traefik/v33.7.12GHSA-7ghq-v6jf-g56c
Gogithub.com/traefik/traefik/v33.7.12GO-2026-6454

Affected products (as reported)

VendorProductVersions
traefik traefik >= 2.8.2, < 2.11.56>= 3.0.0, < 3.7.12

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References