PYSEC-2026-1066

    Dashboard / Vulnerabilities / PYSEC-2026-1066

    PYSEC-2026-1066

    Published: 6 Jul 2026Last Modified: 7 Jul 2026

    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.

    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

    Affected packages

    Package

    Name: wolfcrypt

    Purl: pkg:pypi/wolfcrypt

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.1.0

    Affected versions

    0.1.8
    0.1.9

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    PYSEC-2026-1066 | CVE-DB