{"id":"CVE-2026-9487","state":"PUBLISHED","title":"XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID","description":"XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID.\n\n_get_signed_xml() in lib/XML/Sig.pm, called from verify(), resolves the SignedInfo Reference/@URI to a node with the XPath expression \"//*[@ID='$id']\" and returns the first node of the resulting node set. A document in which two elements share that ID value is accepted: the digest and signature are checked against whichever element comes first in document order, and the duplicate is not detected.\n\nSuch a document verifies successfully while an application that resolves the same ID independently can read the second, attacker supplied element; in a SAML2 context this places the contents of an Assertion under attacker control.","publishedAt":"2026-08-03T13:14:43.135Z","updatedAt":"2026-08-03T19:59:47.580Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"CISA-ADP"},"assigner":"CPANSec","products":["TIMLEGGE XML::Sig"],"affected":[{"vendor":"TIMLEGGE","product":"XML::Sig","packageName":"XML-Sig","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.71","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["lib/XML/Sig.pm"],"programRoutines":[{"name":"XML::Sig::verify"},{"name":"XML::Sig::_get_signed_xml"}],"repo":"https://github.com/perl-net-saml2/perl-XML-Sig"}],"references":["https://github.com/perl-net-saml2/perl-XML-Sig/commit/4976bde5245df69b8e02c6ae061acbd4891cd7f9.patch","https://metacpan.org/release/TIMLEGGE/XML-Sig-0.71/source/Changes"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:13:52.441Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/9xxx/CVE-2026-9487.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9487","state":"PUBLISHED","datePublished":"2026-08-03T13:14:43.135Z","dateUpdated":"2026-08-03T19:59:47.580Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2026-05-24T13:47:37.954Z"},"containers":{"cna":{"title":"XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID","descriptions":[{"lang":"en","value":"XML::Sig versions before 0.71 for Perl allow signature wrapping via duplicate ID.\n\n_get_signed_xml() in lib/XML/Sig.pm, called from verify(), resolves the SignedInfo Reference/@URI to a node with the XPath expression \"//*[@ID='$id']\" and returns the first node of the resulting node set. A document in which two elements share that ID value is accepted: the digest and signature are checked against whichever element comes first in document order, and the duplicate is not detected.\n\nSuch a document verifies successfully while an application that resolves the same ID independently can read the second, attacker supplied element; in a SAML2 context this places the contents of an Assertion under attacker control."}],"affected":[{"vendor":"TIMLEGGE","product":"XML::Sig","packageName":"XML-Sig","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.71","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["lib/XML/Sig.pm"],"programRoutines":[{"name":"XML::Sig::verify"},{"name":"XML::Sig::_get_signed_xml"}],"repo":"https://github.com/perl-net-saml2/perl-XML-Sig"}],"references":[{"url":"https://github.com/perl-net-saml2/perl-XML-Sig/commit/4976bde5245df69b8e02c6ae061acbd4891cd7f9.patch","tags":["patch"]},{"url":"https://metacpan.org/release/TIMLEGGE/XML-Sig-0.71/source/Changes","tags":["release-notes"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2026-08-03T13:14:43.135Z"},"solutions":[{"lang":"en","value":"Upgrade to version 0.71"}],"source":{"discovery":"UNKNOWN"},"workarounds":[{"lang":"en","value":"Signing the outermost <samlp:Response> element rather than only the inner <saml:Assertion> reduces exposure, but does not prevent wrapping variants in which the duplicate ID is introduced outside the signed element. Upgrading to 0.71 is the complete fix."}],"x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.1,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-03T19:59:25.051641Z","id":"CVE-2026-9487","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-03T19:59:47.580Z"}}]}}}