{"id":"CVE-2021-43568","details":"The verify function in the Stark Bank Elixir ECDSA library (ecdsa-elixir) 1.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.","aliases":["GHSA-xx36-6rv4-gj8r"],"modified":"2026-07-09T05:45:33.283030Z","published":"2021-11-09T22:15:07.553Z","references":[{"type":"ADVISORY","url":"https://github.com/starkbank/ecdsa-elixir/releases/tag/v1.0.1"},{"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-elixir","events":[{"introduced":"54b4472e4f2831cc054d63761ce16e0af1aa10ca"},{"last_affected":"54b4472e4f2831cc054d63761ce16e0af1aa10ca"},{"fixed":"5c3152e95dbea47f92185fdab8be4030d9b86c2c"}],"database_specific":{"extracted_events":[{"introduced":"1.0.0"},{"last_affected":"1.0.0"}],"source":["CPE_STRING","REFERENCES"],"cpe":"cpe:2.3:a:starkbank:elixir_ecdsa:1.0.0:*:*:*:*:*:*:*"}}],"versions":["1.0.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43568.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"}]}