CVE-2026-44368
MediumCVSS 6.9Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
In PyQuorum 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 able to measure the time of secret-sharing operations (e.g., via a remote service) could progressively recover share values, ultimately leading to secret reconstruction. The vulnerability is fixed in 0.2.1.
Risk Assessment
An attacker can exploit a timing attack to recover secret shares and reconstruct the secret, undermining the cryptographic security of the system. The risk affects services performing secret operations in a manner accessible to an attacker.
Recommendation
Upgrade PyQuorum to version 0.2.1. Consider rotating secrets that may have been exposed to the timing attack.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS