{"id":"CVE-2019-13628","aliases":["GHSA-q95h-vc86-hv77","PYSEC-2026-1066"],"title":"wolfCrypt leaks cryptographic information via timing side channel","summary":"wolfCrypt leaks cryptographic information via timing side channel","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","vendor":"wolfcrypt","product":"wolfcrypt","ecosystem":"pip","affected":["wolfcrypt < 4.1.0"],"patched":["wolfcrypt 4.1.0"],"published":"2022-05-24","updated":"2026-07-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-q95h-vc86-hv77","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-13628"},{"url":"https://eprint.iacr.org/2011/232.pdf"},{"url":"https://github.com/wolfSSL/wolfcrypt-py"},{"url":"https://minerva.crocs.fi.muni.cz"},{"url":"https://tches.iacr.org/index.php/TCHES/article/view/7337"},{"url":"http://www.openwall.com/lists/oss-security/2019/10/02/2"}],"tags":["osv","pip"],"epss":0.00365,"epssPercentile":0.30335,"ingestedAt":"2026-07-08T18:25:52.285Z","slug":"CVE-2019-13628","body":"## Overview\n\nwolfSSL 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.\n\n## Affected packages\n\n- `wolfcrypt < 4.1.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `wolfcrypt 4.1.0`","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}