CVE-2026-57209High· 7.0▾ TwilightHeimdall 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 ins…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 25.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
— → 7
0.5%
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.
heimdall < 0.17.17Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
github.com/dadrus/heimdall < 0.17.17Patched in:
github.com/dadrus/heimdall 0.17.17Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-57210High· 7.0Heimdall: IP Spoofing via Unvalidated Forwarding Headers
GHSA-4jgr-pg2m-m988HighHeimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode
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