EUVD-2026-27248

fast-uri vulnerable to host confusion via percent-encoded authority delimiters...

Interpretation Conflict

Overview org.webjars.npm:fast-uri is a Dependency-free RFC 3986 URI toolbox Affected versions of this package are vulnerable to Interpretation Conflict during the decoding of URL host component. An attacker can manipulate the authority component of a URI by supplying percent-encoded delimiters,...

CVE-2026-6322 fast-uri vulnerable to host confusion via percent-encoded authority delimiters

fast-uri normalize decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator...

CVE-2026-6322

CVE-2026-6322 affects the fast-uri package. The vuln lies in normalize(): it decodes percent-encoded authority delimiters inside the host and then re-emits them as raw delimiters during serialization. This can cause a host, which combines an allowed domain, an encoded at-sign, and a different dom...