CVE-2026-120639

CGI versions before 5.00 for Perl allow HTTP header injection via entity decoding after the newline check in header and unchecked values in multipart start and do push.

With autoEscape off, header decodes HTML entities in extra header values after its newline check, so an encoded CR or LF reaches the response. multipart start does not check header values for newlines, and do push does not check the type it prints in each part.

An application that passes request data into these header values can be made to add headers or split the response.