CVE-2026-44368: Svvqt Pyquorum

Medium severity, CVSS 6.9. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Svvqt Pyquorum: before 0.2.1 (fixed in 0.2.1)

Published 2026-05-13. Last modified 2026-06-17.