CVE-2025-55305: 
JavaScript vulnerability analysis and mitigation

CVE-2025-55305 is a moderate severity vulnerability affecting Electron that allows for ASAR Integrity Bypass via resource modification. The vulnerability was discovered and disclosed in September 2025, affecting Electron versions < 35.7.5, >= 36.0.0-alpha.1 < 36.8.1, >= 37.0.0-alpha.1 < 37.3.1, and >= 38.0.0-alpha.1 < 38.0.0-beta.6. This vulnerability only impacts applications that have both the embeddedAsarIntegrityValidation and onlyLoadAppFromAsar fuses enabled (GitHub Advisory).

The vulnerability has a CVSS v3.1 score of 6.1 (Moderate) with the following vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L. The vulnerability is classified under CWE-94 (Improper Control of Generation of Code) and CWE-829 (Inclusion of Functionality from Untrusted Control Sphere). The issue specifically affects applications launched from a filesystem where an attacker has write access, particularly the ability to edit files inside the resources folder in Windows app installations (GitHub Advisory).

The vulnerability has a high impact on system integrity, with low impacts on confidentiality and availability. It specifically affects applications using certain security fuses (embeddedAsarIntegrityValidation and onlyLoadAppFromAsar) which are meant to protect against resource modification (GitHub Advisory).

There are no application-side workarounds available. The only mitigation is to update to a patched version of Electron. The fixed versions are: 38.0.0-beta.6, 37.3.1, 36.8.1, and 35.7.5 (GitHub Advisory).