{"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": "2026-08-19T07:20:09.095Z"}, "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "cveTags": [], "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."}], "id": "CVE-2026-72889", "lastModified": "2026-08-19T08:17:13.833", "metrics": {}, "published": "2026-08-19T08:17:13.833", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.2"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.3"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/vurtdev/Net-OAuth/commit/c467adf45c8d77ac4b92ad78b3eebf949252ba7f.patch"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-c8rm-g5cm-4pf5"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/RRWO/Net-OAuth-0.33/changes"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}, {"lang": "en", "value": "CWE-757"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{}

{}