CVE-2026-42273: Dadrus Heimdall

High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Dadrus Heimdall: before 0.17.14 (fixed in 0.17.14)

Published 2026-05-08. Last modified 2026-06-17.