GitHub Advisoryadvisory · PyPI
GHSA-7r92-3jgr-r65q pyquorum: Timing side‑channel in mul_mod
MEDIUM
Official page ↗
- Aliases
- CVE-2026-44368
- Ecosystem
- PyPI
- Packages
- pyquorum
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- Weaknesses
- CWE-208
- Reviewed
- 2026-05-06
Affected packages
• PyPI pyquorum: < 0.2.1 → fixed in 0.2.1
Description
Impact
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.
Patches
https://github.com/svvqt/pyquorum/releases/tag/v0.2.1
Related
Alias · CVE (1)
- CVE-2026-44368 PyQuorum is a cryptographic library for secret sharing and key management. vulnerability
Weakness · CWE (1)
- CWE-208 Observable Timing Discrepancy weakness
References
- https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q web
- https://nvd.nist.gov/vuln/detail/CVE-2026-44368 advisory
- https://github.com/svvqt/pyquorum/commit/1e9ac41dd3c305c13d7a6b7d227bf325be82d730 web
- https://github.com/svvqt/pyquorum package
- https://github.com/svvqt/pyquorum/releases/tag/v0.2.1 web