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Back to active CVEs
Unknown severity ยท Source severity not reportedCVE-2026-120636

CGI versions before 5.00 for Perl allow open redirects and script injection via URLs built from REQUEST_URI in url and start_formCVE-2026-120636

Answer in brief

CVE-2026-120636 records a Unknown severity vulnerability in CGI versions before 5.00 for Perl allow open redirects and script injection via URLs built from REQUEST_URI in url and start_form. The current sources do not mark it as known exploited. The current feed maps CGI (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 4, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps CGI (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
CGIgeneric>=0 <5.005.00

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for CGI.
  2. 2Review the reported fix. Source-reported solution: Upgrade to CGI 5.00 or later.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencemetacpan.org
  • Source referencemetacpan.org
Upstream source description

CGI versions before 5.00 for Perl allow open redirects and script injection via URLs built from REQUEST_URI in url and start_form. url(-absolute=>1), url(-relative=>1) and the default start_form action are built from the client-supplied REQUEST_URI without validation. The result can be protocol-relative (//evil.example), absolute-form (http://evil.example/) or contain backslashes, and url(-relative=>1) can return a javascript: URL. Links and form posts built from these URLs can go to another host.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • CGI::Carp versions before 5.00 for Perl leak warnings across requests in persistent environments via the warningsToBrowser bufferSame cgi package
  • CGI versions before 5.00 for Perl allow form fields to be smuggled past proxies and WAFs via multipart parsing that differs from the RFCsSame cgi package
  • CGI versions before 5.00 for Perl take request parameters from the process command line arguments for an unrecognised REQUEST_METHODSame cgi package
  • CGI versions before 5.00 for Perl allow open redirects via HTML entity decoding of the URL after application validation in redirectSame cgi package
  • 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_pushSame cgi package
  • CGI versions before 5.00 for Perl allow the POSTDATA, PUTDATA, PATCHDATA and XForms:Model parameters to be set from the query string or form fieldsSame cgi package

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-601, CWE-79
Source
CVE List V5
Source checked
Nov 4, 2026
References
3 linked sources
Open source record