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CVE-2026-34774 electron CVE debrief

CVE-2026-34774 is a high-severity use-after-free vulnerability in Electron, a framework for building cross-platform desktop applications. The vulnerability affects applications that use offscreen rendering and allow child windows via window.open(). If the parent offscreen WebContents is destroyed while a child window remains open, subsequent paint frames on the child may dereference freed memory, potentially leading to a crash or memory corruption. Electron versions prior to 39.8.1, 40.7.0, and 41.0.0 are affected. The vulnerability has been patched in these versions. Apps that do not use offscreen rendering or deny child windows are not affected.

Vendor
electron
Product
Unknown
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-04
Original CVE updated
2026-07-24
Advisory published
2026-04-04
Advisory updated
2026-07-24

Who should care

Developers and administrators responsible for Electron-based applications should be aware of this vulnerability. If your application uses offscreen rendering and allows child windows, you should update to a patched version of Electron. This vulnerability could lead to crashes or potential memory corruption if exploited.

Technical summary

The vulnerability exists in Electron's handling of offscreen rendering and child windows created via window.open(). When the parent offscreen WebContents is destroyed while child windows remain open, the application may attempt to access freed memory during subsequent paint frames. This can result in a crash or potential memory corruption. The issue is addressed in Electron versions 39.8.1, 40.7.0, and 41.0.0. Affected applications must use offscreen rendering (webPreferences.offscreen: true) and have a setWindowOpenHandler that permits child windows.

Defensive priority

High priority should be given to updating Electron to a patched version (39.8.1, 40.7.0, or 41.0.0) if your application uses offscreen rendering and allows child windows. Review your application's use of offscreen rendering and window.open() to ensure it aligns with Electron's security guidelines.

Recommended defensive actions

  • Update Electron to version 39.8.1, 40.7.0, or 41.0.0, or later.
  • Review application code to ensure offscreen rendering is not used unnecessarily.
  • Configure setWindowOpenHandler to restrict or handle child windows securely.
  • Monitor application stability and memory usage after updating Electron.
  • Consider implementing additional security measures such as sandboxing or memory protection.

Evidence notes

The CVE-2026-34774 vulnerability was publicly disclosed on April 4, 2026, and has a CVSS score of 8.1. The vulnerability affects Electron versions prior to 39.8.1, 40.7.0, and 41.0.0. The issue was patched by Electronjs and details were provided through their security advisory (GHSA-532v-xpq5-8h95).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34774 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34774

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-34774 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34774

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://github.com/electron/electron/security/advisories/GHSA-532v-xpq5-8h95

    [email protected] - Vendor Advisory

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/security/cve/CVE-2026-34774

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34774.json

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.