Skip to main content
No exploitation reportedFix available

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

No exploitation reported by the sources we read.

  • Published2026-11-04
  • WeaknessCWE-1333 · CWE-625

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-11-0323:40CVE publishedCNA

Versions per branch

Products declared by the CNA1 product

As CPANSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-03

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libcgi-pm-perlUbuntu:26.10all versions · no fixed version listed
  • libcgi-pm-perlUbuntu:26.04:LTSall versions · no fixed version listed
  • libcgi-pm-perlUbuntu:24.04:LTSall versions · no fixed version listed
  • libcgi-pm-perlUbuntu:22.04:LTSall versions · no fixed version listed
  • libcgi-pm-perlUbuntu:20.04:LTSall versions · no fixed version listed
  • libcgi-pm-perlUbuntu:18.04:LTSall versions · no fixed version listed
  • libcgi-pm-perlUbuntu:16.04:LTSall versions · no fixed version listed
  • libcgi-pm-perlDebian:14all versions · no fixed version listed

4 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-120645 Red Hat Product Security4 known affected

    perl-cgi: perl-cgi: Denial of Service via unescaped regular expression injection in scrolling_list

    perl-CGI.src as a component of Red Hat Enterprise Linux 10 · perl-CGI.src as a component of Red Hat Enterprise Linux 7 · perl-CGI.src as a component of Red Hat Enterprise Linux 8 · +1 more

Full record on NVD

Fix

  1. No fix available, says the vendor Red Hat Product Security CVE-2026-120645 · 4 productsFix deferred

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-11-04
Last Modified
2026-11-09
NVD status
Deferred
GitHub Advisory
GHSA-8xqm-fm8j-xv84

Frequently asked questions

What is 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. 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.

Is CVE-2026-120645 actively exploited?

Active exploitation of CVE-2026-120645 has not been confirmed. Its EPSS score was 0.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-120645?

CVE-2026-120645 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running perl-cgi? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record