CVE-2026-120645

CGI versions before 5.00 for Perl allow denial of service via submitted values used as a regex for optgroup selection in scrolling_list

State: Published
Severity: Not scored
Published: Nov 3, 2026
Updated: Nov 3, 2026
Reserved: Nov 2, 2026

Read the record on cve.org

Description

CGI versions before 5.00 for Perl allow denial of service via submitted values used as a regex for optgroup selection in scrolling_list.

When rendering option groups, scrolling_list marks the selected options by interpolating each selected value, by default taken from the request parameters, unescaped into a substitution pattern.

A client can make the request die with an invalid pattern, or tie up the process with one that backtracks heavily.

Scores

The record has no CVSS score.

Weaknesses

CWE-1333 Inefficient Regular Expression Complexity
CWE-625 Permissive Regular Expression

Affected Products

Product	Versions
CGI	before 5.00Affected

References

https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pmtechnical-description
https://metacpan.org/release/LEEJO/CGI-5.00/changesrelease-notes
https://github.com/leejo/CGI.pm/commit/824956fbb0c4eb77044ba2dc9180a30df12cb309.patchpatch

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