CVE-2026-25949

HIGH 7.5

Traefik: TCP readTimeout bypass via STARTTLS on Postgres

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400
Vendor	traefik
Product	traefik
Published	Feb 12, 2026
Last Updated	Jun 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

traefik / traefik

< 3.6.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w github.com: https://github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678 github.com: https://github.com/traefik/traefik/releases/tag/v3.6.8 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-25949 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2439522 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25949.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6192