Vulnerability-Lookup

FKIE_CVE-2026-34776

Vulnerability from fkie_nvd - Published: 2026-04-04 00:16 - Updated: 2026-07-24 22:10

Severity

5.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on macOS and Linux, apps that call app.requestSingleInstanceLock() were vulnerable to an out-of-bounds heap read when parsing a crafted second-instance message. Leaked memory could be delivered to the app's second-instance event handler. This issue is limited to processes running as the same user as the Electron app. Apps that do not call app.requestSingleInstanceLock() are not affected. Windows is not affected by this issue. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

References

	URL	Tags
	security-advisories@github.com	https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885	Vendor Advisory

Impacted products

Vendor	Product	Version
electronjs	electron	*
electronjs	electron	*
electronjs	electron	*
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0
electronjs	electron	41.0.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "electron",
          "vendor": "electron",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 38.8.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 39.0.0-alpha.1, \u003c 39.8.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 40.0.0-alpha.1, \u003c 40.8.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 41.0.0-alpha.1, \u003c 41.0.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "9CE003A2-03CC-4355-AA17-2CBD204EC6C3",
              "versionEndExcluding": "38.8.6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "8F28D187-306E-4C9D-ADED-56DD79B04AF3",
              "versionEndExcluding": "39.8.1",
              "versionStartIncluding": "39.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "A8E19E38-B08F-4075-A564-E14DC3F54078",
              "versionEndExcluding": "40.8.1",
              "versionStartIncluding": "40.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha1:*:*:*:node.js:*:*",
              "matchCriteriaId": "A20225D6-F435-4D09-962D-B162F521B6AD",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha2:*:*:*:node.js:*:*",
              "matchCriteriaId": "33712802-EB60-4E9A-83B8-9F2320B70CB4",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha3:*:*:*:node.js:*:*",
              "matchCriteriaId": "9D0A9142-54FE-47BB-9FEB-5E97528E28FE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha4:*:*:*:node.js:*:*",
              "matchCriteriaId": "9E1D191F-DEAE-4DB3-9822-F31AF9FE3BAC",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha5:*:*:*:node.js:*:*",
              "matchCriteriaId": "45A8192F-3D2C-4987-9BBE-7ECC3F71965D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha6:*:*:*:node.js:*:*",
              "matchCriteriaId": "EEA1A2E5-03DB-46CB-8427-7F31A8A7CE1C",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta1:*:*:*:node.js:*:*",
              "matchCriteriaId": "B2DFCE75-BD3F-4537-B5B8-14097E262EA2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta2:*:*:*:node.js:*:*",
              "matchCriteriaId": "BC346E25-EA43-4615-8CDB-16D15D46E4FF",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta3:*:*:*:node.js:*:*",
              "matchCriteriaId": "FA5B3C00-CAFC-4995-BF35-9920F3039E77",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta4:*:*:*:node.js:*:*",
              "matchCriteriaId": "3672F3FB-6B5E-40FD-8A92-CB4DD6BC6A93",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta5:*:*:*:node.js:*:*",
              "matchCriteriaId": "9EE4F8AE-21D2-4815-85B7-B7ECCC0D5059",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta6:*:*:*:node.js:*:*",
              "matchCriteriaId": "D195760C-7DD9-4259-9042-EDE65AEAC1D6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta7:*:*:*:node.js:*:*",
              "matchCriteriaId": "B370859F-24D3-4B25-B580-1A5B6DB94BFE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta8:*:*:*:node.js:*:*",
              "matchCriteriaId": "7F47CFAE-9744-4B54-B7E4-BB8E4346FDBA",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on macOS and Linux, apps that call app.requestSingleInstanceLock() were vulnerable to an out-of-bounds heap read when parsing a crafted second-instance message. Leaked memory could be delivered to the app\u0027s second-instance event handler. This issue is limited to processes running as the same user as the Electron app. Apps that do not call app.requestSingleInstanceLock() are not affected. Windows is not affected by this issue. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0."
    },
    {
      "lang": "es",
      "value": "Electron es un framework para escribir aplicaciones de escritorio multiplataforma usando JavaScript, HTML y CSS. Antes de las versiones 38.8.6, 39.8.1, 40.8.1 y 41.0.0, en macOS y Linux, las aplicaciones que llaman a app.requestSingleInstanceLock() eran vulnerables a una lectura de heap fuera de l\u00edmites al analizar un mensaje de segunda instancia manipulado. La memoria filtrada podr\u00eda ser entregada al gestor de eventos de segunda instancia de la aplicaci\u00f3n. Este problema se limita a procesos que se ejecutan como el mismo usuario que la aplicaci\u00f3n Electron. Las aplicaciones que no llaman a app.requestSingleInstanceLock() no se ven afectadas. Windows no se ve afectado por este problema. Este problema ha sido parcheado en las versiones 38.8.6, 39.8.1, 40.8.1 y 41.0.0."
    }
  ],
  "id": "CVE-2026-34776",
  "lastModified": "2026-07-24T22:10:00.140",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34776",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-06T15:31:24.470937Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-04T00:16:18.753",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

CVE-2026-34776 (GCVE-0-2026-34776)

Vulnerability from cvelistv5 – Published: 2026-04-03 23:56 – Updated: 2026-04-06 15:31

Title

Electron: Out-of-bounds read in second-instance IPC on macOS and Linux

Summary

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-06 15:31 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/electron/electron/security/adv…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
electron	electron	Affected: < 38.8.6 Affected: >= 39.0.0-alpha.1, < 39.8.1 Affected: >= 40.0.0-alpha.1, < 40.8.1 Affected: >= 41.0.0-alpha.1, < 41.0.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-34776",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-06T15:31:24.470937Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-06T15:31:46.052Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "electron",
          "vendor": "electron",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 38.8.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 39.0.0-alpha.1, \u003c 39.8.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 40.0.0-alpha.1, \u003c 40.8.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 41.0.0-alpha.1, \u003c 41.0.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on macOS and Linux, apps that call app.requestSingleInstanceLock() were vulnerable to an out-of-bounds heap read when parsing a crafted second-instance message. Leaked memory could be delivered to the app\u0027s second-instance event handler. This issue is limited to processes running as the same user as the Electron app. Apps that do not call app.requestSingleInstanceLock() are not affected. Windows is not affected by this issue. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-03T23:56:42.200Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885"
        }
      ],
      "source": {
        "advisory": "GHSA-3c8v-cfp5-9885",
        "discovery": "UNKNOWN"
      },
      "title": "Electron: Out-of-bounds read in second-instance IPC on macOS and Linux"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-34776",
    "datePublished": "2026-04-03T23:56:42.200Z",
    "dateReserved": "2026-03-30T19:54:55.555Z",
    "dateUpdated": "2026-04-06T15:31:46.052Z",
    "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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-34776

CVE-2026-34776 (GCVE-0-2026-34776)

Tags

Sightings

Nomenclature