CVE-2026-57210

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when the trusted_proxies option is configured, heimdall extracts client IP addresses from the Forwarded (for= parameter) and X-Forwarded-For headers and exposes them as Request.ClientIPAddresses to the rule pipeline. However, extracted values are not validated to be syntactically valid IP addresses. Arbitrary strings, malformed IP literals, and RFC 7239 unknown values and obfuscated identifiers are accepted without further checks. In addition, the Forwarded header parser splits on , and ; without accounting for RFC 7239 quoted strings, which can cause a single quoted value to be parsed as multiple entries, with fragments — including trailing quote characters — treated as independent addresses. This issue has been patched in version 0.17.17.

CVSS

No CVSS.

References

Link	Resource
https://github.com/dadrus/heimdall/releases/tag/v0.17.17
https://github.com/dadrus/heimdall/security/advisories/GHSA-38x9-25wx-7fg2

Configurations

No configuration.

History

23 Oct 2026, 13:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-23 13:17

Updated : 2026-10-29 04:18

NVD link : CVE-2026-57210

Mitre link : CVE-2026-57210

CVE.ORG link : CVE-2026-57210

JSON object : View

Products Affected

No product.

CWE

CWE-20

Improper Input Validation

CWE-116

Improper Encoding or Escaping of Output

CWE-290

Authentication Bypass by Spoofing

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