CVE-2026-42272

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall handles URL-encoded slashes %2F in a case-sensitive manner, while percent-encoding is defined to be case-insensitive. As a result, the lowercase equivalent %2f is not recognized...

GHSA-43JV-5J4X-QV67 Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation

Summary Heimdall handles URL-encoded slashes %2F in a case-sensitive manner, while percent-encoding is defined to be case-insensitive. As a result, the lowercase equivalent %2f is not recognized and therefore not processed as expected when allowencodedslashes is set to off the default setting. Th...