Insertion of Sensitive Information Into Sent Data Affecting github.com/traefik/traefik/v3/pkg/middlewares/customerrors package, versions <3.6.15>=3.7.0-ea.1 <3.7.0-rc.3
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-GITHUBCOMTRAEFIKTRAEFIKV3PKGMIDDLEWARESCUSTOMERRORS-16419311
- published5 May 2026
- disclosed4 May 2026
- creditlalalala5678
Introduced: 4 May 2026
CVE-2026-41181 Â (opens in a new tab)How to fix?
Upgrade github.com/traefik/traefik/v3/pkg/middlewares/customerrors to version 3.6.15, 3.7.0-rc.3 or higher.
Overview
Affected versions of this package are vulnerable to Insertion of Sensitive Information Into Sent Data in the errors middleware process. An attacker can obtain sensitive authentication headers, such as Authorization and Cookie, by triggering a backend response that matches the configured error status range, causing these headers to be forwarded to a separate error page service. This is only exploitable if the errors middleware is configured to use a distinct error page service.