CVE-2026-25949

Summary

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 Software

Weaknesses

• CWE-400: CWE-400: Uncontrolled Resource Consumption

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

github.com/traefik/traefik: Traefik: Denial of Service via stalled STARTTLS requests

Additional References

• 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
• https://access.redhat.com/errata/RHSA-2026:6192

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

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