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CVE-2026-34781 electron CVE debrief

CVE-2026-34781 is a denial of service vulnerability in Electron, a framework for writing cross-platform desktop applications using JavaScript, HTML, and CSS. Apps that call clipboard.readImage() may be vulnerable if the system clipboard contains image data that fails to decode, triggering a controlled abort and crashing the process. This issue does not allow memory corruption or code execution. The vulnerability is fixed in Electron versions 39.8.5, 40.8.5, 41.1.0, and 42.0.0-alpha.5.

Vendor
electron
Product
Unknown
CVSS
LOW 2.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-07
Original CVE updated
2026-07-24
Advisory published
2026-04-07
Advisory updated
2026-07-24

Who should care

Developers and users of Electron applications that read images from the clipboard, particularly those using versions prior to 39.8.5, 40.8.5, 41.1.0, and 42.0.0-alpha.5, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability occurs when apps call clipboard.readImage() and the system clipboard contains image data that fails to decode. The resulting null bitmap is passed unchecked to image construction, triggering a controlled abort and crashing the process. This issue does not allow memory corruption or code execution. The fix involves updating Electron to a version that handles image decoding failures properly.

Defensive priority

Low

Recommended defensive actions

  • Update Electron to version 39.8.5, 40.8.5, 41.1.0, or 42.0.0-alpha.5 or later
  • Review and limit the use of clipboard.readImage() in your application
  • Implement error handling for image decoding failures
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-07T22:16:23.123Z and was last modified on 2026-07-24T22:10:00.140Z. The NVD entry is currently Analyzed. The Electron framework versions prior to 39.8.5, 40.8.5, 41.1.0, and 42.0.0-alpha.5 are affected by this vulnerability. Developers should verify their application usage of clipboard.readImage() and review system clipboard contents.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34781 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34781

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

  • CVE-2026-34781 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34781

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

Supplemental references

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.