CVE-2026-25949
Traefik: TCP readTimeout bypass via STARTTLS on Postgres
- State
- Published
- Severity
- 7.5 High
- Published
- Feb 12, 2026
- Updated
- Jul 15, 2026
- Reserved
- Feb 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
traefiktraefik |
|
References
- https://github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w
- https://github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678
- https://github.com/traefik/traefik/releases/tag/v3.6.8
- https://access.redhat.com/security/cve/CVE-2026-25949vdb-entry
- RHBZ#2439522issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25949.json
- https://access.redhat.com/errata/RHSA-2026:6192vendor-advisory
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