CVE-2026-120634 (GCVE-0-2026-120634)

Vulnerability from cvelistv5 – Published: 2026-11-03 23:40 – Updated: 2026-11-09 19:06
VLAI
Title
CGI::Carp versions before 5.00 for Perl leak warnings across requests in persistent environments via the warningsToBrowser buffer
Summary
CGI::Carp versions before 5.00 for Perl leak warnings across requests in persistent environments via the warningsToBrowser buffer. Warnings are held in a package-level buffer until warningsToBrowser writes them into the page as HTML comments, and the buffer is never cleared between requests. Under mod_perl, FastCGI or PSGI, warnings from one request are written into a later one. Warnings that contain one user's request data can appear in the HTML sent to another user.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 19:06 UTC
CWE
  • CWE-488 - Exposure of Data Element to Wrong Session
Assigner
CPANSec CNA
References
Impacted products
Vendor Product Version
Affected: 0 , < 5.00 (custom)
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-120634",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-11-09T19:06:22.430750Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-09T19:06:50.795Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "CGI::Carp"
          ],
          "packageName": "CGI",
          "packageURL": "pkg:cpan/CGI",
          "programFiles": [
            "lib/CGI/Carp.pm"
          ],
          "programRoutines": [
            {
              "name": "CGI::Carp::warningsToBrowser"
            }
          ],
          "repo": "https://github.com/leejo/CGI.pm",
          "versions": [
            {
              "lessThan": "5.00",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "CGI::Carp versions before 5.00 for Perl leak warnings across requests in persistent environments via the warningsToBrowser buffer.\n\nWarnings are held in a package-level buffer until warningsToBrowser writes them into the page as HTML comments, and the buffer is never cleared between requests. Under mod_perl, FastCGI or PSGI, warnings from one request are written into a later one.\n\nWarnings that contain one user\u0027s request data can appear in the HTML sent to another user."
        }
      ],
      "problemTypes": [
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          "descriptions": [
            {
              "cweId": "CWE-488",
              "description": "CWE-488 Exposure of Data Element to Wrong Session",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-03T23:40:08.097Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI/Carp.pm"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/LEEJO/CGI-5.00/changes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/leejo/CGI.pm/commit/604a83fec105f75fe06f1a75026c4c34fd5a1f61.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to CGI 5.00 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CGI::Carp versions before 5.00 for Perl leak warnings across requests in persistent environments via the warningsToBrowser buffer",
      "workarounds": [
        {
          "lang": "en",
          "value": "For deployments that cannot upgrade, do not use warningsToBrowser in persistent environments. After upgrading, persistent applications where nothing calls CGI::initialize_globals between requests must also call CGI::Carp::_reset_globals at the start of each request."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-120634",
    "datePublished": "2026-11-03T23:40:08.097Z",
    "dateReserved": "2026-11-02T17:40:16.533Z",
    "dateUpdated": "2026-11-09T19:06:50.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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