Vulnerability Description
Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when Heimdall operates in proxy mode, it constructs the Forwarded HTTP header after executing the matched rule pipeline by inserting the incoming request's Host header value directly into the header string without sanitizing commas or semicolons. This allows an attacker to inject additional parameters into the Forwarded header, potentially spoofing IP addresses for upstream services. This issue has been patched in version 0.17.17.
Related Weaknesses (CWE)
References
- https://github.com/dadrus/heimdall/releases/tag/v0.17.17
- https://github.com/dadrus/heimdall/security/advisories/GHSA-4jgr-pg2m-m988
- https://github.com/dadrus/heimdall/security/advisories/GHSA-4jgr-pg2m-m988
FAQ
What is CVE-2026-57209?
CVE-2026-57209 is a documented vulnerability. Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when Heimdall operates in proxy mode, it constructs the Forwarded HTTP header after execu...
How severe is CVE-2026-57209?
CVSS scoring is not yet available for CVE-2026-57209. Check NVD for updates.
Is there a patch for CVE-2026-57209?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.