svvqt/pyquorum · Security
pyquorum: Timing side‑channel in mul_mod
- GHSA ID
- GHSA-7r92-3jgr-r65q
- CVE ID
- CVE-2026-44368
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.9 · 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
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
CWEs
- CWE-208 · Observable Timing Discrepancy
References
- 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 ↗
- https://github.com/advisories/GHSA-7r92-3jgr-r65q ↗