Improper Handling of Case Sensitivity Affecting github.com/traefik/traefik/v3/pkg/middlewares/forwardedheaders package, versions >=3.1.3 <3.6.9
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMTRAEFIKTRAEFIKV3PKGMIDDLEWARESFORWARDEDHEADERS-15435548
- published6 Mar 2026
- disclosed5 Mar 2026
- creditOleh Konko
Introduced: 5 Mar 2026
CVE-2026-29054 (opens in a new tab)How to fix?
Upgrade github.com/traefik/traefik/v3/pkg/middlewares/forwardedheaders to version 3.6.9 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Case Sensitivity in the processing of HTTP/1.1 requests when handling the Connection header with X-Forwarded headers. An attacker can cause the removal of forwarded identity headers by sending requests with lowercase Connection tokens that match protected header names.
Note:
This issue is a bypass of the fix for CVE-2024-45410.