CVE-2026-16412 encompasses a set of memory safety bugs in Mozilla Firefox ESR 140.12 and Firefox 152, some showing evidence of memory corruption that could be exploited to execute arbitrary code. The vulnerabilities include use-after-free, invalid pointer dereferences, integer overflows, and sandbox escapes across multiple components including DOM navigation, JavaScript engine (JIT and WebAssembly), audio/video processing, graphics, and networking. Mozilla released fixes for these issues in Firefox 153 and Firefox ESR 140.13. The advisory lists numerous related CVEs with high to critical impact, all addressed in these fixed versions.

The vulnerabilities can lead to arbitrary code execution, privilege escalation, sandbox escape, information disclosure, and denial of service. The CVSS score of 9.8 indicates critical severity with high impact on confidentiality, integrity, and availability. Exploit code is publicly known for some related issues, though no active exploitation in the wild has been confirmed. Successful exploitation could compromise user systems running affected Firefox versions.

Mozilla has released official fixes for these vulnerabilities in Firefox 153 and Firefox ESR 140.13. Users and administrators should update to these versions or later immediately to mitigate the risk. No additional mitigation steps are required beyond applying the official patches.