wolfCrypt leaks cryptographic information via timing side channel
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | wolfcrypt | < 4.1.0 | 4.1.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2019-13628
- https://eprint.iacr.org/2011/232.pdf
- https://github.com/wolfSSL/wolfcrypt-py
- https://minerva.crocs.fi.muni.cz
- https://tches.iacr.org/index.php/TCHES/article/view/7337
- http://www.openwall.com/lists/oss-security/2019/10/02/2
- https://pypi.org/project/wolfcrypt
- https://github.com/advisories/GHSA-q95h-vc86-hv77
- CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-203- Platform
- Python (PyPI)
- Package
wolfcrypt- Disclosed
- 24.05.2022
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1066 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-q95h-vc86-hv77 - CC BY 4.0
Vulnerability history: wolfcrypt
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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