Vulnerability-Lookup

GHSA-7R92-3JGR-R65Q

Vulnerability from github – Published: 2026-05-06 22:40 – Updated: 2026-05-14 20:42

Summary

pyquorum: Timing side‑channel in mul_mod

Details

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

Severity

6.9 (Medium)


                  
                    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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyquorum"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44368"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-208"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T22:40:15Z",
    "nvd_published_at": "2026-05-13T21:16:47Z",
    "severity": "MODERATE"
  },
  "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\u2011sharing 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",
  "id": "GHSA-7r92-3jgr-r65q",
  "modified": "2026-05-14T20:42:45Z",
  "published": "2026-05-06T22:40:15Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pyquorum: Timing side\u2011channel in mul_mod"
}

CVE-2026-44368 (GCVE-0-2026-44368)

Vulnerability from cvelistv5 – Published: 2026-05-13 20:18 – Updated: 2026-05-15 18:44

Title

PyQuorum: Timing side‑channel in mul_mod

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.

Severity

6.9 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-208 - Observable Timing Discrepancy

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/svvqt/pyquorum/security/adviso…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
svvqt	pyquorum	Affected: < 0.2.1

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-44368",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-15T18:43:46.865680Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-15T18:44:14.203Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pyquorum",
          "vendor": "svvqt",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.2.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u2011sharing 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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-208",
              "description": "CWE-208: Observable Timing Discrepancy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T20:18:12.910Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/svvqt/pyquorum/security/advisories/GHSA-7r92-3jgr-r65q"
        }
      ],
      "source": {
        "advisory": "GHSA-7r92-3jgr-r65q",
        "discovery": "UNKNOWN"
      },
      "title": "PyQuorum: Timing side\u2011channel in mul_mod"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44368",
    "datePublished": "2026-05-13T20:18:12.910Z",
    "dateReserved": "2026-05-05T20:15:20.631Z",
    "dateUpdated": "2026-05-15T18:44:14.203Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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