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Vulnerability · Published Feb 12, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity uncontrolled resource consumption in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 43.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/traefik/traefikno fix listedGO-2026-4484
Gogithub.com/traefik/traefik/v2no fix listedGO-2026-4484
Gogithub.com/traefik/traefik/v33.6.8GHSA-89p3-4642-cr2w
Gogithub.com/traefik/traefik/v33.6.8GO-2026-4484

Affected products (as reported)

VendorProductVersions
traefik traefik < 3.6.8

Weakness: CWE-400, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References