{"id":"CVE-2019-13628","aliases":["GHSA-q95h-vc86-hv77","PYSEC-2026-1066"],"url":"https://o3.security/vulnerability/CVE-2019-13628","summary":"wolfCrypt leaks cryptographic information via timing side channel","details":"wolfSSL and wolfCrypt 4.0.0 and earlier (when configured without --enable-fpecc, --enable-sp, or --enable-sp-math) contain a timing side channel in ECDSA signature generation. This allows a local attacker, able to precisely measure the duration of signature operations, to infer information about the nonces used and potentially mount a lattice attack to recover the private key used. The issue occurs because ecc.c scalar multiplication might leak the bit length.","published":"2019-10-03T14:15:11.057Z","modified":"2026-07-22T03:44:48.596752Z","cvss":{"score":4.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"wolfcrypt","fixedVersion":"4.1.0"}],"fix":null,"references":[{"type":"WEB","url":"https://minerva.crocs.fi.muni.cz/"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2019/10/02/2"},{"type":"ADVISORY","url":"https://eprint.iacr.org/2011/232.pdf"},{"type":"ADVISORY","url":"https://tches.iacr.org/index.php/TCHES/article/view/7337"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-22T03:44:48.596752Z"}}