Resource exhaustion in Traefik
CVE-2026-25949
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001
Affected products
- Traefik — versions < 3.6.8
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w (Patch, Vendor Advisory)
- github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678 (Patch)
- github.com/traefik/traefik/releases/tag/v3.6.8 (Product, Release Notes)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-25949?
- CVE-2026-25949 is a high-severity vulnerability in Traefik, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-02-12.
- How severe is CVE-2026-25949?
- High severity. CVSS v3 base score is 7.5 out of 10.