Executive brief
A security vulnerability has been identified in the Mozilla Firefox web browser's networking component. This flaw could allow a malicious website to bypass the browser's security sandbox, which is designed to isolate web content from the rest of the computer system. If successfully exploited, an attacker could potentially gain unauthorized access to the underlying operating system or user data.
Technical details
A sandbox escape vulnerability was identified in the DOM: Networking component of Mozilla Firefox. While specific root cause details (such as use-after-free or buffer overflow) are restricted in the associated bug report, the vulnerability allows a process within the content sandbox to interact with the host system in an unauthorized manner via the networking stack. The attack vector typically involves a user visiting a specially crafted malicious webpage. The vulnerability is classified by Mozilla as having 'moderate' impact and is resolved in Firefox 153.
Affected products
- Mozilla Firefox < 153
Timeline
- 2026-07-21: advisory: Mozilla Foundation Security Advisory 2026-68 published
- 2026-07-21: patched: Fixed in Firefox 153