HIGH 7.0 NVD
CVE-2026-57209
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 construc
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.
References
- https://github.com/dadrus/heimdall/releases/tag/v0.17.17
- https://github.com/dadrus/heimdall/security/advisories/GHSA-4jgr-pg2m-m988
This high severity vulnerability with a CVSS score of 7.0 was published on 2026-10-23 via NVD.
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