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TI-2026-29804 Aliases CVE-2026-41181GHSA-p6hg-qh38-555r

Traefik: Errors middleware forwards Authorization and Cookie headers to separate error page service

Priority LOW 37CWE-201Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
None · None · None
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-201.

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.44, 3.6.15, and 3.7.0-rc.3, there is an information disclosure vulnerability in Traefik's errors (custom error pages) middleware. When the backend returns a response matching the configured status range, the middleware forwards the original request's complete header set, including Authorization, Cookie, and other authentication material, to the separate error page service rather than only the minimal context needed to render the error page. This behavior is undocumented: the documentation states only that Host is forwarded by default, so operators are not warned that sensitive credentials are shared across service boundaries. Deployments using the errors middleware with a distinct error page service may inadvertently expose end-user credentials to infrastructure that was not intended to receive them. This vulnerability is fixed in 2.11.44, 3.6.15, and 3.7.0-rc.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00445 38th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial traefik (traefik): 3.7.0-rc.3, 3.6.14, 2.11.43github.com/traefik/traefik/v2 (Go): 2.11.44+1 more productRed Hat: 1 without a fix

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
traefiktraefik3.7.0-rc.0 to before 3.7.0-rc.3; 3.0.0-beta1 to before 3.6.14; before 2.11.433.7.0-rc.3, 3.6.14, 2.11.43Patch availableCNA
—github.com/traefik/traefik/v2 (Go)before 2.11.442.11.44Patch availableGHSA-p6hg-qh38-555r
—github.com/traefik/traefik/v3 (Go)before 3.6.153.6.15Patch availableGHSA-p6hg-qh38-555r
—github.com/traefik/traefik/v3 (Go)3.7.0-rc.0 to before 3.7.0-rc.33.7.0-rc.3Patch availableGHSA-p6hg-qh38-555r
  • traefik Vendortraefik Affected 3.7.0-rc.0 to before 3.7.0-rc.3; 3.0.0-beta1 to before 3.6.14; before 2.11.43 Fixed in 3.7.0-rc.3, 3.6.14, 2.11.43 Patch available CNA
  • github.com/traefik/traefik/v2 (Go) Vendor— Affected before 2.11.44 Fixed in 2.11.44 Patch available GHSA-p6hg-qh38-555r
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected before 3.6.15 Fixed in 3.6.15 Patch available GHSA-p6hg-qh38-555r
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.7.0-rc.0 to before 3.7.0-rc.3 Fixed in 3.7.0-rc.3 Patch available GHSA-p6hg-qh38-555r

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*before 2.11.44; 3.0.0 to before 3.6.15Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*3.7.0 ea1Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:*3.7.0 ea2Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:*3.7.0 ea3Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:*3.7.0 rc1Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:rc2:*:*:*:*:*:*3.7.0 rc2Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.11.44; 3.0.0 to before 3.6.15 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:* Versions 3.7.0 ea1 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:* Versions 3.7.0 ea2 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:* Versions 3.7.0 ea3 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:* Versions 3.7.0 rc1 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:rc2:*:*:*:*:*:* Versions 3.7.0 rc2 Vulnerable ·traefik

Remediation

  • Fix · CNA traefik (traefik) Fixed in 3.7.0-rc.3, 3.6.14, 2.11.43
  • Fix · GHSA-p6hg-qh38-555r github.com/traefik/traefik/v2 (Go) Fixed in 2.11.44 Advisory →
  • Fix · GHSA-p6hg-qh38-555r github.com/traefik/traefik/v3 (Go) Fixed in 3.6.15 Advisory →
  • Fix · GHSA-p6hg-qh38-555r github.com/traefik/traefik/v3 (Go) Fixed in 3.7.0-rc.3 Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat OpenShift Dev SpacesAffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-41181
  2. 2026-10-03 Alias added: GHSA-p6hg-qh38-555r

References

Exploit 1

Advisory 1

Other 4

  • 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