An integer overflow vulnerability exists in the JavaScript: WebAssembly component of Mozilla Firefox, identified as CVE-2026-16369. This flaw could potentially lead to security issues due to improper handling of integer values within WebAssembly processing. Mozilla fixed this vulnerability in Firefox 153 and Firefox ESR 140.13 as part of a broader security update addressing multiple high-impact vulnerabilities. The advisory notes the impact as high but does not report any active exploitation in the wild. The fix is included in the official releases mentioned.

The vulnerability could allow an attacker to cause unexpected behavior in the JavaScript WebAssembly engine, potentially leading to memory corruption or other security issues. The impact is rated high by Mozilla, indicating serious security concerns if exploited. However, there are no known active exploits targeting this vulnerability at this time.

Mozilla has released official fixes for this vulnerability in Firefox 153 and Firefox ESR 140.13. Users and administrators should update to these versions or later to remediate the issue. Since this is not a cloud service, remediation depends on applying the vendor's official patches. Patch status is confirmed by the vendor advisory.