CGI versions before 5.00 for Perl return request-derived values untainted under taint mode.

The upload filename, uploadInfo values, some path_info and script_name values, Accept results, and the name lists from url_param and cookie are returned without the taint flag, as is a cookie named expires from 4.67 on.

These values come from regex captures or hash keys, which Perl does not taint, so they pass -T checks unvalidated.

CGI versions before 5.00 for Perl return request-derived values untainted under taint mode.

The upload filename, uploadInfo values, some path_info and script_name values, Accept results, and the name lists from url_param and cookie are returned without the taint flag, as is a cookie named expires from 4.67 on.

These values come from regex captures or hash keys, which Perl does not taint, so they pass -T checks unvalidated.

perl-CGI-5.20.0-1.1 on GA media

Affected: Ubuntu:16.04:LTS: libcgi-pm-perl, Ubuntu:18.04:LTS: libcgi-pm-perl, Ubuntu:20.04:LTS: libcgi-pm-perl, Ubuntu:22.04:LTS: libcgi-pm-perl, Ubuntu:24.04:LTS: libcgi-pm-perl, Ubuntu:26.10: libcgi-pm-perl, Ubuntu:26.04:LTS: libcgi-pm-perl

CGI versions before 5.00 for Perl return request-derived values untainted under taint mode. The upload filename, uploadInfo values, some path_info and script_name values, Accept results, and the name lists from url_param and cookie are returned without the taint flag, as is a cookie named expires from 4.67 on. These values come from regex captures or hash keys, which Perl does not taint, so they pass -T checks unvalidated.