CVE-2026-44368: pyquorum Timing Side‑channel Vulnerability

MODERATE
Advisory Identifier: GHSA-7r92-3jgr-r65q
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CWE-208
Published
Advisory Summary

CVE-2026-44368 is a MODERATE timing side‑channel vulnerability (CWE-208: Observable Timing Discrepancy) affecting pyquorum libraries in the PyPI ecosystem. The issue involves timing side‑channel in mul_mod. Remediation is available by upgrading affected packages to version 0.2.1.

CVE-2026-44368 at a Glance

CVE Identifier CVE-2026-44368
GHSA Identifier GHSA-7r92-3jgr-r65q
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-208: Observable Timing Discrepancy
Affected Product pyquorum
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2026-44368

To remediate this vulnerability, upgrade all affected pyquorum dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pyquorum fixed: 0.2.1 
pip install pyquorum>=0.2.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show pyquorum

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-44368, inspect your installed packages using pip:

pip show pyquorum

Analyze the terminal output to locate any version of pyquorum in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.2.1), your application is affected.

Note: The pip show pyquorum command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-208: Observable Timing Discrepancy, where two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. In pyquorum, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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

CVE-2026-44368 Affected pyquorum Versions

1 component(s)
Fixed Versions:
0.2.1
Product / Package Ecosystem Affected Versions Fixed Version
pyquorum
pypi/pyquorum
PyPI
< 0.2.1
0.2.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q
NVD — CVE-2026-44368 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44368
Security Fix Commit FIX COMMIT
https://github.com/svvqt/pyquorum/commit/1e9ac41dd3c305c13d7a6b7d227bf325be82d730
pyquorum Source Repository REPOSITORY
https://github.com/svvqt/pyquorum
pyquorum Release RELEASE
https://github.com/svvqt/pyquorum/releases/tag/v0.2.1

Frequently Asked Questions

What is CVE-2026-44368?
CVE-2026-44368 is a security vulnerability in pyquorum involving Timing side‑channel in mul_mod under CWE-208: Observable Timing Discrepancy.
Which pyquorum versions are affected?
Affected versions include releases prior to 0.2.1 across affected packages: pyquorum.
What version fixes CVE-2026-44368?
Upgrading to 0.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pyquorum affected?
Yes, pyquorum is affected in releases prior to 0.2.1. Upgrade your dependency to 0.2.1 or later.
What CWE is associated with CVE-2026-44368?
CVE-2026-44368 is classified under CWE-208: Observable Timing Discrepancy (Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.).
How can I check PyPI dependencies for CVE-2026-44368?
Run the dependency tree command: 'pip show pyquorum'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7r92-3jgr-r65q",
  "modified" : "2026-05-14T20:42:45Z",
  "published" : "2026-05-06T22:40:15Z",
  "aliases" : [ "CVE-2026-44368" ],
  "summary" : "pyquorum: Timing side‑channel in mul_mod",
  "details" : "### Impact\nThe `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.\n\n### Patches\nhttps://github.com/svvqt/pyquorum/releases/tag/v0.2.1",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pyquorum"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-44368"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/svvqt/pyquorum/commit/1e9ac41dd3c305c13d7a6b7d227bf325be82d730"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/svvqt/pyquorum"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/svvqt/pyquorum/releases/tag/v0.2.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-208" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T22:40:15Z",
    "nvd_published_at" : "2026-05-13T21:16:47Z"
  }
}