Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

CVE-2026-44368PyQuorum: Timing side‑channel in mul_mod

Medium 6.9

In plain English

A medium-severity security flaw in pyquorum from svvqt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.3%top 75.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	pyquorum	0.2.1	GHSA-7r92-3jgr-r65q
PyPI	pyquorum	0.2.1	PYSEC-2026-3028

Affected products (as reported)

Vendor	Product	Versions
svvqt	pyquorum	< 0.2.1

Weakness: CWE-208 · 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

References

https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q x_refsource_CONFIRM