CVE-2026-25949

Traefik: TCP readTimeout bypass via STARTTLS on Postgres

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests. An unauthenticated client can bypass Traefik entrypoint respondingTimeouts.readTimeout by sending the 8-byte Postgres SSLRequest (STARTTLS) prelude and then stalling, causing connections to remain open indefinitely, leading to a denial of service. This vulnerability is fixed in 3.6.8.

Affected

traefik

CVSS v3.1 CNA

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.91% chance of exploitation in the next 30 days, 59th percentile

Published

2026-02-12

Updated

2026-07-15

Proof-of-concept exploits (1)

• advisories/GHSA-89p3-4642-cr2w

Security advisories

• traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w
• traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678

References

• CVE Record
• NVD entry