Traefik: TCP readTimeout bypass via STARTTLS on Postgres
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.7%
exploitation probability
0.7%top 50% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
traefik · traefikReferences
https://access.redhat.com/errata/RHSA-2026:6192https://access.redhat.com/security/cve/CVE-2026-25949https://bugzilla.redhat.com/show_bug.cgi?id=2439522https://github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678https://github.com/traefik/traefik/releases/tag/v3.6.8https://github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2whttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25949.json