{"id":"PYSEC-2020-163","details":"A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. Without this verification, a malformed signature could be accepted, making the signature malleable. Without proper verification, an attacker could use a malleable signature to create false transactions.","aliases":["CVE-2019-14859","GHSA-8qxj-f9rh-9fg2"],"modified":"2023-11-08T04:01:11.569013Z","published":"2020-01-02T15:15:00Z","references":[{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14859"},{"type":"WEB","url":"https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3"},{"type":"REPORT","url":"https://github.com/warner/python-ecdsa/issues/114"},{"type":"PACKAGE","url":"https://pypi.org/project/ecdsa/0.13.3/"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-8qxj-f9rh-9fg2"}],"affected":[{"package":{"name":"ecdsa","ecosystem":"PyPI","purl":"pkg:pypi/ecdsa"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13.3"}]}],"versions":["0.6","0.7","0.8","0.9","0.10","0.11","0.12","0.13","0.13.1","0.13.2"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/ecdsa/PYSEC-2020-163.yaml"}}],"schema_version":"1.7.3"}