UBUNTU-CVE-2026-120633
Dashboard / Vulnerabilities / UBUNTU-CVE-2026-120633
Summary:
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=>1) 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.
References: https://ubuntu.com/security/CVE-2026-120633, https://www.cve.org/CVERecord?id=CVE-2026-120633, https://lists.security.metacpan.org/cve-announce/msg/44874727/, https://github.com/leejo/CGI.pm/commit/d76752a5e8dfd365b0fe3a0b9a7da6c054e856af, https://github.com/leejo/CGI.pm/commit/d76752a5e8dfd365b0fe3a0b9a7da6c054e856af.patch, https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm, https://metacpan.org/release/LEEJO/CGI-5.00/changes
Affected packages
Package
Name: libcgi-pm-perl
Purl: pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=xenial
Affected ranges
Type: ECOSYSTEM
Events:
