CVE-2026-120633None▾ SunlitCGI 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
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.
CGI < 5.00Upgrade to CGI 5.00 or later.
For deployments that cannot upgrade, strip X-Forwarded-Host at the web server or proxy unless it sets the header itself, and validate Host.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-120636NoneCGI versions before 5.00 for Perl allow open redirects and script injection via URLs built from REQUEST_URI in url and start_form
CVE-2026-120638NoneCGI versions before 5.00 for Perl allow open redirects via HTML entity decoding of the URL after application validation in redirect
CVE-2026-120650NoneCGI versions before 5.00 for Perl allow memory, CPU and disk exhaustion via missing or unenforced request size, parameter and upload limits
CVE-2026-120641NoneCGI versions before 5.00 for Perl return upload filenames with any client-supplied path, including ../ and Windows paths
CVE-2026-120639NoneCGI 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
CVE-2026-120640NoneCGI versions before 5.00 for Perl allow the POSTDATA, PUTDATA, PATCHDATA and XForms:Model parameters to be set from the query string or form fields