{"id":"UBUNTU-CVE-2019-14859","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.","modified":"2026-01-30T00:56:34.120552Z","published":"2019-10-14T00:00:00Z","related":["USN-4196-1"],"upstream":["CVE-2019-14859"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-14859"},{"type":"REPORT","url":"https://en.bitcoinwiki.org/wiki/Transaction_Malleability"},{"type":"REPORT","url":"https://github.com/warner/python-ecdsa/pull/115"},{"type":"REPORT","url":"https://github.com/warner/python-ecdsa/pull/124"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4196-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-14859"}],"affected":[{"package":{"name":"python-ecdsa","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-ecdsa@0.13-2ubuntu0.16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13-2ubuntu0.16.04.1"}]}],"versions":["0.13-2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.13-2ubuntu0.16.04.1","binary_name":"python-ecdsa"},{"binary_version":"0.13-2ubuntu0.16.04.1","binary_name":"python3-ecdsa"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-14859.json"}},{"package":{"name":"python-ecdsa","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python-ecdsa@0.13-2ubuntu0.18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13-2ubuntu0.18.04.1"}]}],"versions":["0.13-2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.13-2ubuntu0.18.04.1","binary_name":"python-ecdsa"},{"binary_version":"0.13-2ubuntu0.18.04.1","binary_name":"python3-ecdsa"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-14859.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}