CVE-2026-120633 (GCVE-0-2026-120633)

Vulnerability from cvelistv5 – Published: 2026-11-03 23:40 – Updated: 2026-11-03 23:40
VLAI
Title
CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_port
Summary
CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_port. These take the host name and port from the X-Forwarded-Host request header when present, and otherwise from Host, without validating either. The URLs from url and self_url are the default redirect location and the start_html(-base=>1) base href, and the default start_form action when REQUEST_URI is not set. A client can poison shared caches, and URLs the application stores or sends, with redirects, links and scripts that point at a host it controls.
Severity
No CVSS data available.
CWE
  • CWE-348 - Use of Less Trusted Source
  • CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
CPANSec CNA under the redhat root
CNA scorecard C 61/100 over 361 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Affected: 0 , < 5.00 (custom)
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
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          "defaultStatus": "unaffected",
          "modules": [
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          ],
          "packageName": "CGI",
          "packageURL": "pkg:cpan/CGI",
          "programFiles": [
            "lib/CGI.pm"
          ],
          "programRoutines": [
            {
              "name": "CGI::url"
            },
            {
              "name": "CGI::self_url"
            },
            {
              "name": "CGI::virtual_host"
            },
            {
              "name": "CGI::virtual_port"
            }
          ],
          "repo": "https://github.com/leejo/CGI.pm",
          "versions": [
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              "status": "affected",
              "version": "0",
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_port.\n\nThese take the host name and port from the X-Forwarded-Host request header when present, and otherwise from Host, without validating either. The URLs from url and self_url are the default redirect location and the start_html(-base=\u003e1) base href, and the default start_form action when REQUEST_URI is not set.\n\nA client can poison shared caches, and URLs the application stores or sends, with redirects, links and scripts that point at a host it controls."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-348",
              "description": "CWE-348 Use of Less Trusted Source",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-601",
              "description": "CWE-601 URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-03T23:40:04.604Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "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": [
            "patch"
          ],
          "url": "https://github.com/leejo/CGI.pm/commit/d76752a5e8dfd365b0fe3a0b9a7da6c054e856af.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to CGI 5.00 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_port",
      "workarounds": [
        {
          "lang": "en",
          "value": "For deployments that cannot upgrade, strip X-Forwarded-Host at the web server or proxy unless it sets the header itself, and validate Host."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-120633",
    "datePublished": "2026-11-03T23:40:04.604Z",
    "dateReserved": "2026-11-02T17:40:07.895Z",
    "dateUpdated": "2026-11-03T23:40:04.604Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-11-08",
      "epss": "0.00131",
      "percentile": "0.02698"
    },
    "microsoft_vex": {
      "current_release_date": "2026-11-07T01:03:59.000Z",
      "cve": "CVE-2026-120633",
      "id": "msrc_CVE-2026-120633",
      "initial_release_date": "2026-11-07T01:03:59.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_port",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-120633.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "collectionURL": "https://cpan.org/modules",
                "defaultStatus": "unaffected",
                "modules": [
                  "CGI"
                ],
                "packageName": "CGI",
                "packageURL": "pkg:cpan/CGI",
                "programFiles": [
                  "lib/CGI.pm"
                ],
                "programRoutines": [
                  {
                    "name": "CGI::url"
                  },
                  {
                    "name": "CGI::self_url"
                  },
                  {
                    "name": "CGI::virtual_host"
                  },
                  {
                    "name": "CGI::virtual_port"
                  }
                ],
                "repo": "https://github.com/leejo/CGI.pm",
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            "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_port.\n\nThese take the host name and port from the X-Forwarded-Host request header when present, and otherwise from Host, without validating either. The URLs from url and self_url are the default redirect location and the start_html(-base=\u003e1) base href, and the default start_form action when REQUEST_URI is not set.\n\nA client can poison shared caches, and URLs the application stores or sends, with redirects, links and scripts that point at a host it controls."
          }
        ],
        "id": "CVE-2026-120633",
        "lastModified": "2026-11-04T18:42:35.810",
        "metrics": {},
        "published": "2026-11-04T00:17:24.450",
        "references": [
          {
            "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
            "url": "https://github.com/leejo/CGI.pm/commit/d76752a5e8dfd365b0fe3a0b9a7da6c054e856af.patch"
          },
          {
            "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
            "url": "https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm"
          },
          {
            "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
            "url": "https://metacpan.org/release/LEEJO/CGI-5.00/changes"
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        ],
        "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
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                "value": "CWE-348"
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                "lang": "en",
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            "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T05:30:48+00:00",
      "cve": "CVE-2026-120633",
      "id": "CVE-2026-120633",
      "initial_release_date": "2026-11-03T23:40:04.604000+00:00",
      "product_status:known_affected": "4",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "perl-CGI: perl-CGI: Web cache poisoning and URL manipulation via untrusted host headers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-120633.json",
      "version": "3"
    }
  }
}



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