CVE-2026-120644 — CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via unvalidated path, domain and expires values

Exploitation evidence

Not listed in the latest downloaded CISA KEV catalog. This does not establish an absence of exploitation.

KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗

Reported products and versions

/

Default status: unaffected

affected: 0 to < 5.00 (custom)

Fixes and workarounds

Upgrade to CGI 5.00 or later.

Sources and related reporting

CVE Program record ↗ · Download tracked evidence as JSON

Monitored source mentions

BleepingComputer — Microsoft November 2026 Patch Tuesday fixes 1,235 flaws, Outlook zero-day ↗

Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.

Observed change timeline

History begins when Egret first downloads each source. It is not the complete upstream CVE history.

12 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-12",
  "epss": 0.00424,
  "percentile": 0.37198
}

11 Nov 2026, 12:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-10",
  "epss": 0.00424,
  "percentile": 0.37039
}

11 Nov 2026, 12:20 Jerusalem · CVE Program record changed

Stored CNA snapshot at this observation.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 9.1,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-120644",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-09T19:32:41.590437Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-09T19:33:06.251Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "CGI::Cookie"
          ],
          "packageName": "CGI",
          "packageURL": "pkg:cpan/CGI",
          "programFiles": [
            "lib/CGI/Cookie.pm"
          ],
          "programRoutines": [
            {
              "name": "CGI::Cookie::as_string"
            },
            {
              "name": "CGI::Cookie::path"
            },
            {
              "name": "CGI::Cookie::domain"
            },
            {
              "name": "CGI::Cookie::expires"
            }
          ],
          "repo": "https://github.com/leejo/CGI.pm",
          "versions": [
            {
              "lessThan": "5.00",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via unvalidated path, domain and expires values.\n\nThe path, domain and expires values are written into the Set-Cookie header without checking for semicolons or control characters.\n\nAn application that sets them from request data can be made to add other cookie attributes, such as Domain or SameSite."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-116",
              "description": "CWE-116 Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-03T23:40:51.418Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI/Cookie.pm"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/LEEJO/CGI-5.00/changes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/leejo/CGI.pm/commit/0b3527faaa9de55f79ca7d59dd3bcfb2c5540e00.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to CGI 5.00 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via unvalidated path, domain and expires values",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-120644",
    "datePublished": "2026-11-03T23:40:51.418Z",
    "dateReserved": "2026-11-02T17:42:50.237Z",
    "dateUpdated": "2026-11-09T19:33:06.251Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}