CVE-2026-44368 json
PyQuorum: Timing side‑channel in mul_mod
published 2026-05-06 6 mo ago modified 2026-10-26 14 d ago also GHSA-7r92-3jgr-r65q , PYSEC-2026-3028 , EUVD-2026-30161
- cvss
- 6.9
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 24%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi pyquorum 0.2.1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | pyquorum | <0.2.1 |
0.2.1 |
Affected products
- svvqt pyquorum
Classification
- Weakness
-
- CWE-208 Observable Timing Discrepancy
References
-
github.com
/svvqt/pyquorum/commit/1e9ac41dd3c305c13d7a6b7d227bf325be82d730
web
-
github.com
/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-44368
advisory
-
github.com
/svvqt/pyquorum
package
-
github.com
/svvqt/pyquorum/releases/tag/v0.2.1
web
-
pypi.org
/project/pyquorum
package
-
github.com
/advisories/GHSA-7r92-3jgr-r65q
advisory
Sources
- CVE List CVE-2026-44368
- GitHub Advisory GHSA-7r92-3jgr-r65q
- NVD CVE-2026-44368
- OSV PYSEC-2026-3028
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