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.

The version of Traefik installed on the remote macOS host is prior to 2.11.44 or 3.x prior to 3.6.15. It is, therefore, affected by an information disclosure vulnerability:

  - Traefik's errors middleware forwards Authorization and Cookie headers to separate error page service.
    (CVE-2026-41181)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-41181)

ID	Name	Product	Family	Severity
313202	Traefik < 2.11.44 / 3.x < 3.6.15 Information Disclosure (GHSA-p6hg-qh38-555r)	Nessus	MacOS X Local Security Checks	medium
441055	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-p6hg-qh38-555r)	Tenable Cloud Security	SCA Checks	medium
441055	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-p6hg-qh38-555r)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2026-41181

medium

Tenable Plugins

medium

medium

medium