CVE-2026-34778

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Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, a service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data. Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions. 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, un service worker ejecut\u00e1ndose en una sesi\u00f3n podr\u00eda falsificar mensajes de respuesta en el canal IPC interno utilizado por webContents.executeJavaScript() y m\u00e9todos relacionados, causando que la promesa del proceso principal se resolviera con datos controlados por el atacante. Las aplicaciones solo se ven afectadas si tienen service workers registrados y usan el resultado de webContents.executeJavaScript() (o webFrameMain.executeJavaScript()) en decisiones sensibles a la seguridad. Este problema ha sido parcheado en las versiones 38.8.6, 39.8.1, 40.8.1 y 41.0.0."}], "id": "CVE-2026-34778", "lastModified": "2026-07-24T22:10:00.140", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34778", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-06T15:50:39.913943Z", "version": "2.0.3"}}]}, "published": "2026-04-04T00:16:19.060", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/electron/electron/security/advisories/GHSA-xj5x-m3f3-5x3h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}, {"lang": "en", "value": "CWE-345"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "Electron: Electron: Integrity issue due to IPC channel spoofing by a service worker", "id": "2455024", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455024"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N", "status": "draft"}, "cwe": "CWE-290", "details": ["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, a service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data. Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.", "A flaw was found in Electron, a framework for building desktop applications. A service worker running in a session could spoof reply messages on the internal Inter-Process Communication (IPC) channel. This vulnerability affects applications that have service workers registered and use the results of `webContents.executeJavaScript()` in security-sensitive decisions. An attacker could exploit this to cause the main-process promise to resolve with attacker-controlled data, potentially leading to integrity issues."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-34778", "package_state": [{"cpe": "cpe:/a:redhat:podman_desktop:1", "fix_state": "Fix deferred", "package_name": "podman-desktop-macos-1-0", "product_name": "Red Hat Build of Podman Desktop"}, {"cpe": "cpe:/a:redhat:podman_desktop:1", "fix_state": "Fix deferred", "package_name": "podman-desktop-windows-1-0", "product_name": "Red Hat Build of Podman Desktop"}, {"cpe": "cpe:/a:redhat:podman_desktop:0", "fix_state": "Fix deferred", "package_name": "rhdesktop/rh-podman-desktop-ext-openshift-local-rhel10", "product_name": "Red Hat Build of Podman Desktop - Tech Preview"}], "public_date": "2026-04-03T23:59:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34778\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34778\nhttps://github.com/electron/electron/security/advisories/GHSA-xj5x-m3f3-5x3h"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,38.8.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[39.0.0-alpha.1,39.8.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[40.0.0-alpha.1,40.8.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[41.0.0-alpha.1,41.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "electron", "source": "cna", "vendor": "electron"}, "product": "electron", "vendor": "electron"}], "analysis": {"en": {"generated_at": "2026-04-04T02:50:19.742183+00:00", "value": {"mitigation_remediation": ["Upgrade Electron to version 38.8.6, 39.8.1, 40.8.1, or 41.0.0, or a newer release."], "summary": {"action": "Patch", "impact": "Spoofed IPC replies can compromise security-sensitive decisions"}, "threat_synthesis": {"affected_systems": "The issue affects Electron releases prior to 38.8.6, 39.8.1, 40.8.1, and 41.0.0. Applications that register service workers and subsequently call webContents.executeJavaScript() or webFrameMain.executeJavaScript() and use the result for security checks are impacted. Upstream Electron versions are identified as electron:electron in the CNA feed.", "description_and_impact": "A service worker in an Electron application can fabricate reply messages on the internal IPC channel used by webContents.executeJavaScript(). This allows attacker\u2011controlled data to resolve the promise in the main process, potentially altering security\u2011sensitive decisions that rely on that data. The weakness involves improper authentication control (CWE\u2011290) and delivery of false trustworthy data (CWE\u2011345).", "risk_and_exploitability": "The CVSS score is 5.9, reflecting moderate severity. EPSS score is unavailable and the flaw is not listed in the CISA KEV catalog. Exploitation requires that the attacker control a service worker within the application\u2019s context and that the application processes the executeJavaScript result in a security\u2011sensitive manner. Impact is therefore contingent on application logic, rather than a universal privilege escalation."}}}}, "created": "2026-04-06T20:27:50.753564+00:00", "updated": "2026-04-06T22:21:09.981816+00:00", "vendors": ["electron", "electron$PRODUCT$electron"]}