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CVE-2026-44368

CVE-2026-44368 · PyQuorum: Timing side‑channel in mul_mod

This page contains facts from public vulnerability sources. Check the original advisory before updating.

PyQuorum is a cryptographic library for secret sharing and key management. Prior to 0.2.1, the mul_mod function implements multiplication via a binary expansion loop whose execution time depends on the Hamming weight of the second operand (the exponent). An attacker who can measure the time of secret‑sharing operations (e.g., via a remote service) could progressively recover the values of shares, ultimately leading to secret reconstruction. This vulnerability is fixed in 0.2.1.

CVSS 6.9 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • pyquorum

    Versions
    • < 0.2.1: Affected

    No fix published

  • pyquorum PyPI

    Versions
    • 0.1.0
    • 0.1.1
    • 0.1.2
    • 0.1.3
    • 0.2.0
    Affected ranges
    • ECOSYSTEM: < 0.2.1

    Update to 0.2.1

Original sources

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