CVE-2026-88878
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.
- CVSS 4.0
- 6.9
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 3.1
- 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-25)
- CWE
- CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-7ghq-v6jf-g56c | Go | github.com/traefik/traefik/v2 | >=2.8.2 <2.11.56 | 2.11.56 |
| GHSA-7ghq-v6jf-g56c | Go | github.com/traefik/traefik/v3 | >=3.0.0 <3.7.12 | 3.7.12 |
| GO-2026-6454 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-6454 | Go | github.com/traefik/traefik/v2 | >=2.8.2 <2.11.56 | 2.11.56 |
| GO-2026-6454 | Go | github.com/traefik/traefik/v3 | >=3.0.0 <3.7.12 | 3.7.12 |