Insertion of Sensitive Information Into Sent Data in Traefik - CVE-2026-41181
Published: May 5, 2026
Vulnerability identifier: #VU129679
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-41181
CWE-ID: CWE-201
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Containous
Affected software:
Traefik
Traefik
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to insertion of sensitive information into sent data in the errors middleware when forwarding requests to a separate error page service after a backend response matches the configured status range. A remote attacker can send a request containing sensitive headers to disclose sensitive information.
Only deployments that use the errors middleware with a distinct error page service are affected.
How to mitigate CVE-2026-41181
Install security update from vendor's website.