CVE-2026-54672 in electron-builder
Summary
by MITRE • 07/01/2026
electron-updater allows for automatic updates for Electron apps. Prior to 26.15.0, AppImage targets built by app-builder-lib could use an empty path component when setting the LD_LIBRARY_PATH environment variable at runtime. This causes the current working directory to be added to the dynamic linker search path, which may allow an attacker to execute arbitrary code by placing a malicious shared library in the directory from which the AppImage is launched. This issue has been fixed in version 26.15.0.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/01/2026
The electron-updater library serves as a critical component for managing automatic updates in Electron-based applications, providing developers with seamless update mechanisms across various platforms including Linux distributions through AppImage packaging. This vulnerability specifically affects the AppImage target implementation where the app-builder-lib tool generates executable packages that may inadvertently introduce security risks during runtime execution. The flaw manifests when the system processes the LD_LIBRARY_PATH environment variable, which controls the dynamic linker search path for shared libraries.
The technical root cause of this vulnerability stems from improper handling of path components within the LD_LIBRARY_PATH environment variable during AppImage execution. When an empty path component exists in the environment variable definition, the dynamic linker interprets this as a reference to the current working directory, effectively adding it to the library search path. This behavior creates a dangerous scenario where any shared library located in the same directory as the launched AppImage could be loaded and executed by the application, regardless of its authenticity or intended purpose.
This vulnerability operates under the principle of insecure library loading, which aligns with CWE-427 and CWE-428 classification standards that address issues related to uncontrolled search paths and improper environment variable handling. The attack vector becomes particularly dangerous when considering that AppImages are often launched from user-accessible directories such as desktop folders, download locations, or other shared spaces where attackers could place malicious shared libraries. The exploit requires minimal privileges and can be executed simply by placing a crafted shared library file in the directory containing the vulnerable AppImage.
The operational impact of this vulnerability extends beyond simple code execution, potentially allowing for privilege escalation, data theft, or system compromise depending on the target application's permissions and capabilities. Applications leveraging electron-updater for automatic updates become particularly susceptible since they often run with elevated privileges during update processes, making the attack surface even more critical. The vulnerability affects all versions prior to 26.15.0, meaning that any Electron application using older versions of electron-updater with AppImage packaging is potentially exposed to this risk.
Mitigation strategies should focus on immediate version upgrades to 26.15.0 or later, which implements proper path validation and sanitization for the LD_LIBRARY_PATH environment variable. Security-conscious developers should also consider implementing additional runtime protections such as setting restrictive LD_PRELOAD environment variables, using secure library loading practices, and conducting regular security audits of their update mechanisms. Organizations deploying Electron applications should perform comprehensive vulnerability assessments to identify all affected installations and ensure that updated versions are properly deployed across their infrastructure.
The ATT&CK framework categorizes this vulnerability under technique T1059.007 for execution through shared libraries and potentially T1546.008 for privilege escalation through insecure library loading. This represents a significant concern for enterprise security teams as it demonstrates how seemingly innocuous packaging and update mechanisms can introduce critical attack vectors into otherwise secure application ecosystems, emphasizing the importance of thorough security testing throughout the software development lifecycle including dependency validation and runtime environment auditing processes.