High severityNVD Advisory· Published Oct 23, 2026· Updated Oct 23, 2026
CVE-2026-57209
CVE-2026-57209
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/dadrus/heimdallGo | < 0.17.17 | 0.17.17 |
Affected products
1Patches
Vulnerability mechanics
References
3News mentions
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