{"id":"CVE-2021-43571","details":"The verify function in the Stark Bank Node.js ECDSA library (ecdsa-node) 1.1.2 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.","aliases":["GHSA-q9q6-f556-gpm7"],"modified":"2026-05-15T04:37:32.386783Z","published":"2021-11-09T22:15:07.683Z","references":[{"type":"ADVISORY","url":"https://github.com/starkbank/ecdsa-node/releases/tag/v1.1.3"},{"type":"EVIDENCE","url":"https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/starkbank/ecdsa-node","events":[{"introduced":"0"},{"last_affected":"49c6003f3259be3105995a8034510061c64dff16"}],"database_specific":{"cpe":"cpe:2.3:a:starkbank:ecdsa-node:1.1.2:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"1.1.2"}],"source":"CPE_FIELD"}}],"versions":["v1.1.2","v1.1.1","v1.1.0","v1.0.0","v0.0.3"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-43571.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}