CVE-2025-14861

Vulnerability

Details

CVE-2025-14861 describes a set of memory safety bugs present in Firefox 146. The Mozilla Fuzzing Team, led by Andrew McCreight, discovered these issues, which showed evidence of memory corruption [1]. The root cause lies in improper memory handling within the browser engine, leading to conditions such as use-after-free or buffer overflows that could be triggered by crafted web content.

Exploitation

An attacker could exploit these vulnerabilities by enticing a user to visit a specially crafted web page. No additional privileges or user interaction beyond normal browsing is required, as the bugs are reachable through standard web content processing. The attack surface is broad, given that memory safety bugs in the browser engine can be triggered through JavaScript, CSS, or DOM manipulation.

Impact

Successful exploitation could allow an attacker to execute arbitrary code in the context of the Firefox process, potentially leading to full system compromise. Given the high severity (CVSS 8.8) and Mozilla's assessment that these bugs could be exploited with enough effort, the risk of remote code execution is significant [1][2].

Mitigation

Mozilla addressed these issues in Firefox 146.0.1, released on December 18, 2025 [1]. Users should update to this version or later to remediate the vulnerability. No workarounds are available, and the update is strongly recommended.