{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-19873", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-08-14T12:57:36.382Z", "datePublished": "2026-08-31T10:07:32.134Z", "dateUpdated": "2026-08-31T17:57:13.999Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "modules": ["HTML::FormFu"], "packageName": "HTML-FormFu", "packageURL": "pkg:cpan/HTML-FormFu", "programFiles": ["lib/HTML/FormFu/Element/Repeatable.pm", "lib/HTML/FormFu/Constraint.pm"], "programRoutines": [{"name": "HTML::FormFu::Element::Repeatable::process"}, {"name": "HTML::FormFu::Element::Repeatable::repeat"}, {"name": "HTML::FormFu::Constraint::_find_field_value"}], "repo": "https://github.com/FormFu/HTML-FormFu", "versions": [{"lessThanOrEqual": "2.08", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-1284", "description": "CWE-1284 Improper Validation of Specified Quantity in Input", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-08-31T10:07:32.134Z"}, "references": [{"tags": ["issue-tracking"], "url": "https://github.com/FormFu/HTML-FormFu/issues/71"}, {"tags": ["patch"], "url": "https://security.metacpan.org/patches/H/HTML-FormFu/2.08/CVE-2026-19873-r1.patch"}], "solutions": [{"lang": "en", "value": "Apply the patch. There is no fixed release."}], "source": {"discovery": "UNKNOWN"}, "title": "HTML::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from the query string in Repeatable elements", "workarounds": [{"lang": "en", "value": "For deployments that cannot apply the patch, reject or clamp the counter parameter before passing the query to process. Where the client-side repeat feature is not needed, unsetting counter_name stops the count being read from the query string."}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/08/31/7"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-08-31T12:11:31.961Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-08-31T17:56:55.337977Z", "id": "CVE-2026-19873", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-31T17:57:13.999Z"}}]}}

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{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "modules": ["HTML::FormFu"], "packageName": "HTML-FormFu", "packageURL": "pkg:cpan/HTML-FormFu", "programFiles": ["lib/HTML/FormFu/Element/Repeatable.pm", "lib/HTML/FormFu/Constraint.pm"], "programRoutines": [{"name": "HTML::FormFu::Element::Repeatable::process"}, {"name": "HTML::FormFu::Element::Repeatable::repeat"}, {"name": "HTML::FormFu::Constraint::_find_field_value"}], "repo": "https://github.com/FormFu/HTML-FormFu", "versions": [{"lessThanOrEqual": "2.08", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-19873", "lastModified": "2026-08-31T18:17:14.143", "metrics": {"cvssMetricV31": [{"cvssData": {"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", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-19873", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-31T17:56:55.337977Z", "version": "2.0.3"}}]}, "published": "2026-08-31T10:16:49.790", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/FormFu/HTML-FormFu/issues/71"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://security.metacpan.org/patches/H/HTML-FormFu/2.08/CVE-2026-19873-r1.patch"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/31/7"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}, {"lang": "en", "value": "CWE-1284"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

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