CVE-2026-120646 (GCVE-0-2026-120646)

Vulnerability from cvelistv5 – Published: 2026-11-03 23:40 – Updated: 2026-11-09 19:36
VLAI
Title
CGI versions from 4.71 before 5.00 for Perl allow denial of service via a plain string dereferenced as a symbolic reference in uploadInfo
Summary
CGI versions from 4.71 before 5.00 for Perl allow denial of service via a plain string dereferenced as a symbolic reference in uploadInfo. uploadInfo dereferences its argument and calls its filename method without checking that it is an upload filehandle. A plain string naming a defined global variable, such as the parameter value from ?upload=0, is treated as a symbolic reference, and the method call on it dies.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 19:36 UTC
CWE
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
Assigner
CPANSec CNA
References
Impacted products
Vendor Product Version
Affected: 4.71 , < 5.00 (custom)
Show details on NVD website
To clipboard 

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              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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                "id": "CVE-2026-120646",
                "options": [
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                    "Technical Impact": "partial"
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                "timestamp": "2026-11-09T19:36:04.858365Z",
                "version": "2.0.3"
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          "dateUpdated": "2026-11-09T19:36:34.629Z",
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    "cna": {
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          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
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          "packageName": "CGI",
          "packageURL": "pkg:cpan/CGI",
          "programFiles": [
            "lib/CGI.pm"
          ],
          "programRoutines": [
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              "name": "CGI::uploadInfo"
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          "versions": [
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              "status": "affected",
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              "versionType": "custom"
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          "lang": "en",
          "value": "CGI versions from 4.71 before 5.00 for Perl allow denial of service via a plain string dereferenced as a symbolic reference in uploadInfo.\n\nuploadInfo dereferences its argument and calls its filename method without checking that it is an upload filehandle. A plain string naming a defined global variable, such as the parameter value from ?upload=0, is treated as a symbolic reference, and the method call on it dies."
        }
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        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
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      "references": [
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/LEEJO/CGI-5.00/changes"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/leejo/CGI.pm/commit/a14a7decfdc18f2daf436d30df9b543e3f0f8da3.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to CGI 5.00 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
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      "title": "CGI versions from 4.71 before 5.00 for Perl allow denial of service via a plain string dereferenced as a symbolic reference in uploadInfo",
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    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-120646",
    "datePublished": "2026-11-03T23:40:59.008Z",
    "dateReserved": "2026-11-02T17:45:12.662Z",
    "dateUpdated": "2026-11-09T19:36:34.629Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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