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 HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host...

Interpretation Conflict

Overview Affected versions of this package are vulnerable to Interpretation Conflict due to case-sensitive handling of the host matching process. An attacker can bypass access control policies by sending requests with hostnames that differ only in letter casing, potentially gaining unauthorized...

CVE-2026-27588

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP host request matcher is documented as case-insensitive, but when configured with a large host list 100 entries it becomes case-sensitive due to an optimized matching path. An attacker can bypass...