Improper Handling of Case Sensitivity in Traefik - CVE-2026-54763

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Main Vulnerability Database Vulnerabilities #VU136877

Improper Handling of Case Sensitivity in Traefik - CVE-2026-54763

Published: July 3, 2026


Vulnerability identifier: #VU136877
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54763
CWE-ID: CWE-178
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to spoof identity or authorization context.

The vulnerability exists due to improper handling of case sensitivity in BasicAuth, DigestAuth, ForwardAuth, and ingress-nginx snippet authResponseHeaders handling when processing underscore-variant identity headers. A remote user can send a specially crafted request with underscore-variant headers to spoof identity or authorization context.

In the ForwardAuth authResponseHeaders path, exploitation does not require credentials.


Affected software

Traefik
Aruba Networking Private 5G Core

How to mitigate CVE-2026-54763

Install security update from vendor's website.

Traefik - addressed in versions 2.11.51, 3.6.22, 3.7.6
Aruba Networking Private 5G Core - update to 1.26.1.3

External References

Related Security Bulletins