CVE-2026-57209
Severity not reportedHeimdall is a cloud native Identity Aware Proxy and Access Control Decision service.
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.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/dadrus/heimdall/releases/tag/v0.17.17 security-advisories@github.com
- https://github.com/dadrus/heimdall/security/advisories/GHSA-4jgr-pg2m-m988 security-advisories@github.com
- https://github.com/dadrus/heimdall/security/advisories/GHSA-4jgr-pg2m-m988 134c704f-9b21-4f2e-91b3-4a467353bcc0