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TI-2026-20975 Aliases CVE-2026-25949GHSA-89p3-4642-cr2w

Traefik: TCP readTimeout bypass via STARTTLS on Postgres

Priority MEDIUM 40CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00782 56th percentileScored 2026-11-07
Fix Fixed traefik (traefik): 3.6.8github.com/traefik/traefik/v3 (Go): 3.6.8Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
traefiktraefikbefore 3.6.83.6.8Patch availableCNA
—github.com/traefik/traefik/v3 (Go)before 3.6.83.6.8Patch availableGHSA-89p3-4642-cr2w
  • traefik Vendortraefik Affected before 3.6.8 Fixed in 3.6.8 Patch available CNA
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected before 3.6.8 Fixed in 3.6.8 Patch available GHSA-89p3-4642-cr2w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*before 3.6.8Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 3.6.8 Vulnerable ·traefik

Remediation

  • Fix · CNA traefik (traefik) Fixed in 3.6.8
  • Fix · GHSA-89p3-4642-cr2w github.com/traefik/traefik/v3 (Go) Fixed in 3.6.8 Advisory →

Red Hat 1 advisory

  • RHSA-2026:6192 Released 2026-03-30 · Red Hat rating Important
    Red Hat OpenShift Dev Spaces 3.27.0 Release.
    • Red Hat OpenShift Dev Spaces 3.27 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/configbump-rhel9, registry.redhat.io/devspaces/dashboard-rhel9 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Dev Spaces 3.27Fixed RHSA-2026:6192
Not affected: 1 product
  • Red Hat OpenShift Dev Spaces 3.27

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25949
  2. 2026-10-03 Alias added: GHSA-89p3-4642-cr2w

References

Patch 2

Advisory 1

Other 6

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-25774 Uncontrolled Resource Consumption in Traefik CVSS 3.1HIGH 7.5
  • TI-2025-40914 Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules CVSS 4.0MEDIUM 6.9
  • TI-2022-07529 Authorization header displayed in the debug logs CVSS 3.1MEDIUM 6.5
  • TI-2024-30459 HTTP client can remove the X-Forwarded headers in Traefik CVSS 3.1CRITICAL 9.8
  • TI-2026-60261 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect CVSS 4.0CRITICAL 9.3
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences