CVE-2026-25949
Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.78%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.78% probability · 56th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-770
- Affected
- traefik/traefik
- Source
- security-advisories@github.com
EPSS 0.8% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678Patch
- https://github.com/traefik/traefik/releases/tag/v3.6.8Product, Release Notes
- https://github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2wPatch, Vendor Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.