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TI-2019-15112 Aliases CVE-2019-20894GHSA-q9mp-79cp-9g8j

Traefik 2.x, in certain configurations, allows HTTPS sessions to proceed without mutual…

Priority LOW 36CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing, Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-295 and CWE-287.

Summary

Traefik 2.x, in certain configurations, allows HTTPS sessions to proceed without mutual TLS verification in a situation where ERR_BAD_SSL_CLIENT_AUTH_CERT should have occurred.

Why it matters now

EPSS 0.01557 75th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed github.com/traefik/traefik/v2 (Go): 2.2.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—github.com/traefik/traefik/v2 (Go)before 2.2.22.2.2Patch availableGHSA-q9mp-79cp-9g8j
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • github.com/traefik/traefik/v2 (Go) Vendor— Affected before 2.2.2 Fixed in 2.2.2 Patch available GHSA-q9mp-79cp-9g8j

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*2.0.0 to before 2.0.1Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions 2.0.0 to before 2.0.1 Vulnerable ·traefik

Remediation

  • Fix · GHSA-q9mp-79cp-9g8j github.com/traefik/traefik/v2 (Go) Fixed in 2.2.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-20894
  2. 2026-10-03 Alias added: GHSA-q9mp-79cp-9g8j

References

Exploit 1

Advisory 1

Other 2

  • 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