{"id":"UBUNTU-CVE-2026-120633","details":"CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_port. These take the host name and port from the X-Forwarded-Host request header when present, and otherwise from Host, without validating either. The URLs from url and self_url are the default redirect location and the start_html(-base=\u003e1) base href, and the default start_form action when REQUEST_URI is not set. A client can poison shared caches, and URLs the application stores or sends, with redirects, links and scripts that point at a host it controls.","modified":"2026-11-05T11:45:26.858936784Z","published":"2026-11-04T00:17:00Z","upstream":["CVE-2026-120633"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-120633"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-120633"},{"type":"REPORT","url":"https://lists.security.metacpan.org/cve-announce/msg/44874727/"},{"type":"REPORT","url":"https://github.com/leejo/CGI.pm/commit/d76752a5e8dfd365b0fe3a0b9a7da6c054e856af"},{"type":"REPORT","url":"https://github.com/leejo/CGI.pm/commit/d76752a5e8dfd365b0fe3a0b9a7da6c054e856af.patch"},{"type":"REPORT","url":"https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm"},{"type":"REPORT","url":"https://metacpan.org/release/LEEJO/CGI-5.00/changes"}],"affected":[{"package":{"name":"libcgi-pm-perl","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.21-1","4.22-1","4.25-1","4.26-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcgi-pm-perl","binary_version":"4.26-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120633.json"}},{"package":{"name":"libcgi-pm-perl","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.36-1","4.37-1","4.38-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.38-1","binary_name":"libcgi-pm-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120633.json"}},{"package":{"name":"libcgi-pm-perl","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.44-1","4.45-1","4.46-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcgi-pm-perl","binary_version":"4.46-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120633.json"}},{"package":{"name":"libcgi-pm-perl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.51-1","4.53-1","4.54-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcgi-pm-perl","binary_version":"4.54-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120633.json"}},{"package":{"name":"libcgi-pm-perl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.57-1","4.60-1","4.61-1","4.62-1","4.63-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.63-1","binary_name":"libcgi-pm-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120633.json"}},{"package":{"name":"libcgi-pm-perl","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.71-1build1","4.72-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.72-1","binary_name":"libcgi-pm-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120633.json"}},{"package":{"name":"libcgi-pm-perl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.68-1","4.71-1","4.71-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcgi-pm-perl","binary_version":"4.71-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120633.json"}}],"schema_version":"1.9.2","severity":[{"type":"Ubuntu","score":"medium"}]}