User Impersonation Affecting github.com/dadrus/heimdall/internal/handler package, versions <0.17.17
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMDADRUSHEIMDALLINTERNALHANDLER-17738979
- published30 Jun 2026
- disclosed18 Jun 2026
- creditUnknown
Introduced: 18 Jun 2026
CVE NOT AVAILABLE CWE-116 Â (opens in a new tab)Common Weakness Enumeration (CWE) is a category system for software weaknesses
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade github.com/dadrus/heimdall/internal/handler to version 0.17.17 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation via unvalidated parsing of the Forwarded and X-Forwarded-For headers. An attacker can inject arbitrary or malformed values into Request.ClientIPAddresses by supplying crafted forwarding headers. This can lead to bypassing access control logic or influencing upstream services that rely on these headers. This is only exploitable if the trusted_proxies option is configured.