{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72889","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","state":"PUBLISHED","assignerShortName":"CPANSec","dateReserved":"2026-08-10T15:44:58.172Z","datePublished":"2026-08-19T07:20:09.095Z","dateUpdated":"2026-08-26T18:03:05.016Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","modules":["Net::OAuth"],"packageName":"Net-OAuth","packageURL":"pkg:cpan/Net-OAuth","programFiles":["lib/Net/OAuth/Message.pm","lib/Net/OAuth/Request.pm"],"programRoutines":[{"name":"Net::OAuth::Message::verify"},{"name":"Net::OAuth::Message::_signature_method_class"},{"name":"Net::OAuth::Request::signature_key"}],"repo":"https://github.com/vurtdev/Net-OAuth","versions":[{"lessThan":"0.33","status":"affected","version":"0","versionType":"custom"}]}],"descriptions":[{"lang":"en","value":"Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify.\n\nverify resolves the signature method class from the signature_method parameter of the incoming message. signature_method is required on every request, so the algorithm used to check a signature is chosen by whoever sent it, and nothing lets the verifying party pin the method instead. When a message names HMAC-SHA1 or HMAC-SHA256, the key is derived from consumer_secret and token_secret rather than from the key the provider deployed.\n\nA provider deployed on RSA-SHA1 holds only the consumer public key, and RFC 5849 does not use consumer_secret for that method, so the required parameter is filled with a placeholder. A client that names HMAC-SHA1 instead has its signature checked against that placeholder, so a guessable one is enough to forge requests for any consumer key and token."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-757","description":"CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","shortName":"CPANSec","dateUpdated":"2026-08-19T07:20:09.095Z"},"references":[{"tags":["vendor-advisory"],"url":"https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-c8rm-g5cm-4pf5"},{"tags":["patch"],"url":"https://github.com/vurtdev/Net-OAuth/commit/c467adf45c8d77ac4b92ad78b3eebf949252ba7f.patch"},{"tags":["release-notes"],"url":"https://metacpan.org/release/RRWO/Net-OAuth-0.33/changes"},{"tags":["technical-description"],"url":"https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.2"},{"tags":["technical-description"],"url":"https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.3"}],"solutions":[{"lang":"en","value":"Upgrade to Net-OAuth 0.33 or later."}],"source":{"discovery":"UNKNOWN"},"title":"Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify","x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/08/19/2"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-08-19T21:07:38.218Z"}},{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-26T18:02:49.745063Z","id":"CVE-2026-72889","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-26T18:03:05.016Z"}}]}}