CVE-2026-57209
CVE-2026-57209 · Heimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.0 · High
- Published
- Updated
Affected products and versions
heimdall
- Versions
- < 0.17.17: Affected
No fix published