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TI-2026-23199 Aliases CVE-2026-29054GHSA-92mv-8f8w-wq52

Traefik: lowercase `Connection` tokens can delete traefik-managed forwarded identity headers (for example, `X-Real-Ip`)

Priority LOW 39CWE-178Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

Traefik is an HTTP reverse proxy and load balancer. From version 2.11.9 to 2.11.37 and from version 3.1.3 to 3.6.8, there is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This issue has been patched in versions 2.11.38 and 3.6.9.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0053 45th percentileScored 2026-11-07
Fix Fixed traefik (traefik): 2.11.38, 3.6.9github.com/traefik/traefik/v2 (Go): 2.11.38+1 more productRed 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
traefiktraefik2.11.9 to before 2.11.38; 3.1.3 to before 3.6.92.11.38, 3.6.9Patch availableCNA
—github.com/traefik/traefik/v2 (Go)2.11.9 to before 2.11.382.11.38Patch availableGHSA-92mv-8f8w-wq52
—github.com/traefik/traefik/v3 (Go)3.1.3 to before 3.6.93.6.9Patch availableGHSA-92mv-8f8w-wq52
  • traefik Vendortraefik Affected 2.11.9 to before 2.11.38; 3.1.3 to before 3.6.9 Fixed in 2.11.38, 3.6.9 Patch available CNA
  • github.com/traefik/traefik/v2 (Go) Vendor— Affected 2.11.9 to before 2.11.38 Fixed in 2.11.38 Patch available GHSA-92mv-8f8w-wq52
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.1.3 to before 3.6.9 Fixed in 3.6.9 Patch available GHSA-92mv-8f8w-wq52

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*2.11.9 to before 2.11.38; 3.1.3 to before 3.6.9Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions 2.11.9 to before 2.11.38; 3.1.3 to before 3.6.9 Vulnerable ·traefik

Remediation

  • Fix · CNA traefik (traefik) Fixed in 2.11.38, 3.6.9
  • Fix · GHSA-92mv-8f8w-wq52 github.com/traefik/traefik/v2 (Go) Fixed in 2.11.38 Advisory →
  • Fix · GHSA-92mv-8f8w-wq52 github.com/traefik/traefik/v3 (Go) Fixed in 3.6.9 Advisory →

Red Hat 1 advisory

  • RHSA-2026:10175 Released 2026-04-23 · Red Hat rating Important
    Red Hat OpenShift Dev Spaces 3.27.1 Release.
    • Red Hat OpenShift Dev Spaces 3.27 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/devspaces-rhel9-operator +8

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-2026:10175
Not affected: 1 product
  • Red Hat OpenShift Dev Spaces 3.27

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29054
  2. 2026-10-03 Alias added: GHSA-92mv-8f8w-wq52
  3. 2026-10-23 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile
  5. 2026-10-25 Priority changed: MEDIUM → LOW

References

Patch 1

Advisory 1

Other 3

  • 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