What’s Vulnerable › Vulnerabilities

CVE-2026-25949: Traefik: TCP readTimeout bypass via STARTTLS on Postgres

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-12 · updated 2026-07-15
• Weakness: CWE-400

Description

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 products

• Traefik: before 3.6.8 — fixed in 3.6.8

How to fix

Upgrade to a fixed version: Traefik 3.6.8. Check the vendor advisory for mitigations.

References

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

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