CVE-2026-42273

HIGH7.8

Heimdall: Case-sensitive host matching may lead to policy bypass

Published May 8, 2026

Modified 2 weeks ago

Details

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. This issue has been patched in version 0.17.14.

References

WEB

https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943

WEB

https://github.com/dadrus/heimdall/pull/3208

WEB

https://github.com/dadrus/heimdall/releases/tag/v0.17.14

WEB

https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-42273

CVSS Analysis