{
   "document": {
      "aggregate_severity": {
         "text": "high"
      },
      "category": "csaf_security_advisory",
      "csaf_version": "2.0",
      "distribution": {
         "tlp": {
            "label": "WHITE",
            "url": "https://www.first.org/tlp/"
         }
      },
      "lang": "en",
      "notes": [
         {
            "category": "description",
            "text": "HTML::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from the query string in Repeatable elements.\n\nWhen a Repeatable element has counter_name set, its process method reads the repeat count from the named query string parameter, checks only that it is a positive integer, and passes it to repeat, which deep-clones the element's child subtree once per iteration. Nothing caps the value, and no attribute lets an application impose a limit.\n\nThe count is read on every request, before the form decides whether it was submitted, so a plain GET reaches the clone loop with no credentials, no session and no request body. Nesting multiplies: a Repeatable inside a Repeatable takes a counter at each level, so an outer and an inner value of 100 build 10,000 clones.\n\nOnce the form is submitted, each cloned field's constraints scan the whole element tree in _find_field_value, so cost grows faster than linearly with the count. A single request exhausts memory and CPU.\n\nThe latest release on CPAN is 2.07, from 2018. Version 2.08 exists only in the git repository.",
            "title": "Vulnerability Description"
         }
      ],
      "publisher": {
         "category": "other",
         "contact_details": "gdt@cpan.org",
         "name": "giterlizzi",
         "namespace": "https://github.com/giterlizzi/"
      },
      "references": [
         {
            "category": "self",
            "summary": "CPANSA-HTML-FormFu-2026-19873 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-html-formfu-2026-19873.json"
         },
         {
            "category": "external",
            "summary": "https://github.com/FormFu/HTML-FormFu/issues/71",
            "url": "https://github.com/FormFu/HTML-FormFu/issues/71"
         },
         {
            "category": "external",
            "summary": "https://security.metacpan.org/patches/H/HTML-FormFu/2.08/CVE-2026-19873-r1.patch",
            "url": "https://security.metacpan.org/patches/H/HTML-FormFu/2.08/CVE-2026-19873-r1.patch"
         },
         {
            "category": "external",
            "summary": "http://www.openwall.com/lists/oss-security/2026/08/31/7",
            "url": "http://www.openwall.com/lists/oss-security/2026/08/31/7"
         },
         {
            "category": "external",
            "summary": "http://www.openwall.com/lists/oss-security/2026/09/01/1",
            "url": "http://www.openwall.com/lists/oss-security/2026/09/01/1"
         },
         {
            "category": "external",
            "summary": "CVE-2026-19873 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19873"
         }
      ],
      "title": "HTML-FormFu vulnerability",
      "tracking": {
         "current_release_date": "2026-08-31T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-HTML-FormFu-2026-19873",
         "initial_release_date": "2026-08-31T00:00:00",
         "revision_history": [
            {
               "date": "2026-08-31T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>0",
                  "product": {
                     "name": "HTML-FormFu greater than 0",
                     "product_id": "CSAFPID-0001",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/HTML-FormFu"
                     }
                  }
               }
            ],
            "category": "product_name",
            "name": "HTML-FormFu"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2026-19873",
         "cwe": {
            "id": "CWE-770",
            "name": "Allocation of Resources Without Limits or Throttling"
         },
         "notes": [
            {
               "category": "description",
               "text": "HTML::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from the query string in Repeatable elements.\n\nWhen a Repeatable element has counter_name set, its process method reads the repeat count from the named query string parameter, checks only that it is a positive integer, and passes it to repeat, which deep-clones the element's child subtree once per iteration. Nothing caps the value, and no attribute lets an application impose a limit.\n\nThe count is read on every request, before the form decides whether it was submitted, so a plain GET reaches the clone loop with no credentials, no session and no request body. Nesting multiplies: a Repeatable inside a Repeatable takes a counter at each level, so an outer and an inner value of 100 build 10,000 clones.\n\nOnce the form is submitted, each cloned field's constraints scan the whole element tree in _find_field_value, so cost grows faster than linearly with the count. A single request exhausts memory and CPU.\n\nThe latest release on CPAN is 2.07, from 2018. Version 2.08 exists only in the git repository.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 7.5,
                  "baseSeverity": "HIGH",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}