medium6.9
CVE-2026-44368
PyQuorum is a cryptographic library for secret sharing and key management.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pyquorum | < 0.2.1 | 0.2.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-7r92-3jgr-r65q
- https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q
- https://github.com/svvqt/pyquorum/commit/1e9ac41dd3c305c13d7a6b7d227bf325be82d730
- https://github.com/svvqt/pyquorum/releases/tag/v0.2.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-44368