Plattform
nodejs
Komponente
electron
Behoben in
39.8.6
40.0.1
41.0.1
42.0.1
39.8.5
CVE-2026-34781 describes a denial-of-service (DoS) vulnerability within Electron applications. This vulnerability arises when an application attempts to read image data from the system clipboard using clipboard.readImage() and encounters malformed or undecodable image data. The resulting error triggers a controlled abort, leading to the application crashing. This issue affects Electron versions prior to 39.8.5 and can be mitigated by upgrading or implementing clipboard format validation.
The primary impact of CVE-2026-34781 is a denial-of-service condition. An attacker could potentially craft a clipboard image that, when read by a vulnerable Electron application, causes the application to crash. This could disrupt user workflows and potentially lead to data loss if the application was in the middle of a critical operation. While this vulnerability does not allow for memory corruption or code execution, the DoS impact can still be significant, particularly in applications that rely heavily on clipboard interaction. The blast radius is limited to applications that explicitly call clipboard.readImage().
CVE-2026-34781 has a CVSS score of 2.8 (LOW). As of the publication date (2026-04-07), there is no indication of active exploitation or public proof-of-concept (POC) code. The vulnerability is not listed on KEV or EPSS, suggesting a low probability of exploitation. The NVD and CISA databases are still pending updates regarding this CVE.
Applications built with Electron that utilize the clipboard.readImage() function are at risk. This includes a wide range of desktop applications, including those used for image editing, document processing, and communication. Shared hosting environments where multiple Electron applications are deployed on the same server could also be affected, as a malicious image placed in the clipboard by one application could impact others.
• nodejs / supply-chain: Monitor Electron application processes for unexpected crashes or terminations, particularly after clipboard interactions. Use process monitoring tools to identify abnormal resource consumption or error logs related to image decoding.
• generic web: Examine application logs for error messages related to image decoding or clipboard access. Look for patterns indicating failed image processing.
• linux / server: Use lsof to monitor file descriptors associated with Electron processes. Unexpected file descriptor activity related to image files could indicate exploitation attempts.
disclosure
Exploit-Status
EPSS
0.01% (3% Perzentil)
CISA SSVC
CVSS-Vektor
The recommended mitigation for CVE-2026-34781 is to upgrade to Electron version 39.8.5 or later, which includes a fix for this vulnerability. If upgrading is not immediately feasible, a workaround involves validating the clipboard's available formats before attempting to read image data. Specifically, use clipboard.availableFormats() to check if the clipboard contains image data before calling clipboard.readImage(). This prevents the application from attempting to decode invalid image data. After upgrading, confirm the fix by attempting to read an image from a known malformed clipboard image and verifying that the application does not crash.
Actualice Electron a la versión 39.8.5, 40.8.5, 41.1.0 o 42.0.0-alpha.5 o superior para mitigar la vulnerabilidad. Esta actualización corrige el problema al validar correctamente los datos de la imagen del portapapeles, evitando el fallo de la aplicación cuando se encuentra con datos malformados.
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CVE-2026-34781 is a denial-of-service vulnerability in Electron applications that occurs when invalid image data is read from the clipboard using clipboard.readImage(), leading to an application crash.
You are affected if your Electron application uses clipboard.readImage() and is running a version prior to 39.8.5. Applications that do not read images from the clipboard are not affected.
Upgrade your Electron application to version 39.8.5 or later. Before calling clipboard.readImage(), validate that the clipboard contains image data using clipboard.availableFormats().
There are currently no reports of active exploitation of CVE-2026-34781, but it is important to apply the fix to prevent potential future attacks.
Refer to the official Electron security advisory for CVE-2026-34781 on the Electron website: [https://electronjs.org/blog/security-advisories/]
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