CVE-2026-42273 — Heimdall: Case-sensitive host matching may lead to policy bypass
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 …
Published: 2026-05-08 · CVSS: 7.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7