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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
traefik traefik affected
Version Status Constraints
>= 3.7.0-rc.0, < 3.7.0-rc.3 affected —
>= 3.0.0-beta1, < 3.6.14 affected —
< 2.11.43 affected —

No data.

No data.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-p6hg-qh38-555r Traefik's errors middleware forwards Authorization and Cookie headers to separate error page service
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/traefik/traefik/releases/tag/v2.11.44 cve-icon cve-icon
https://github.com/traefik/traefik/releases/tag/v3.6.15 cve-icon cve-icon
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.3 cve-icon cve-icon
https://github.com/traefik/traefik/security/advisories/GHSA-p6hg-qh38-555r cve-icon cve-icon
History

Fri, 15 May 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Traefik
Traefik traefik
Vendors & Products Traefik
Traefik traefik

Fri, 15 May 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Traefik: Errors middleware forwards Authorization and Cookie headers to separate error page service
Weaknesses CWE-201
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-15T16:27:14.823Z

Reserved: 2026-04-17T16:34:45.526Z

Link: CVE-2026-41181

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-15T17:16:46.320

Modified: 2026-05-15T17:16:46.320

Link: CVE-2026-41181

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-15T17:30:04Z

Weaknesses