fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization

Impact fast-uri's mailto scheme parser compares each query field name to the reserved names to, subject, body while the name is still percent-encoded, and only percent-decodes it when storing it as a generic header. On serialize, the decoded name is re-emitted, so a field name such as %74o...

NPM: fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization

NPM: fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization vulnerability discovered by ? in WordPress Npm fast-uri versions = 4.1.3, 4.1.5...