CVE-2026-16412 in Firefox
Summary
by MITRE • 07/21/2026
Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.
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Analysis
by VulDB Data Team • 07/21/2026
Memory safety vulnerabilities in firefox esr 140.12 and firefox 152 represent critical security weaknesses that could potentially lead to remote code execution through memory corruption exploits. these vulnerabilities stem from improper handling of memory operations within the browser's rendering engine and javascript interpreter, creating opportunities for attackers to manipulate memory layouts and execute malicious code. the presence of memory corruption evidence indicates that these flaws could be leveraged to overwrite critical program data or function pointers, enabling arbitrary code execution on vulnerable systems.
the technical nature of these memory safety issues aligns with common vulnerability classifications such as cwe-119 insufficient binding of reference to resource, cwe-121 stack-based buffer overflow, and cwe-787 out-of-bounds write. these flaws typically arise from inadequate input validation, improper memory management, or unsafe pointer arithmetic within firefox's codebase. the vulnerabilities are particularly concerning because they affect both the standard firefox release and the extended support release, indicating widespread exposure across different deployment scenarios.
operational impact of these vulnerabilities extends beyond simple privilege escalation as they provide attackers with potential paths to full system compromise. exploitation could occur through malicious web content loaded in browser windows, making these flaws highly relevant for phishing campaigns or drive-by attacks. the fact that multiple memory corruption opportunities exist within the browser engine suggests a systemic issue rather than isolated incidents, potentially affecting numerous attack vectors including web-based exploits and malicious document delivery methods.
the remediation implemented in firefox 153 and firefox esr 140.13 addresses these memory safety concerns through comprehensive code fixes and improved memory management practices. security patches typically include enhanced bounds checking, improved memory allocation routines, and strengthened input validation mechanisms to prevent the conditions that lead to memory corruption. organizations should prioritize immediate deployment of these updates to protect against potential exploitation attempts. mitigation strategies beyond patching should include browser hardening measures, content filtering, and monitoring for suspicious network activity that might indicate exploitation attempts.
from a threat modeling perspective, these vulnerabilities fall under attack techniques categorized as t1203 legitimate credentials and t1059 command and scripting interpreter within the mitre att&ck framework. the memory corruption nature of these flaws makes them particularly attractive to advanced persistent threat actors seeking to establish persistent access to compromised systems. security teams should implement comprehensive monitoring for anomalous browser behavior, unusual network connections, and potential exploitation attempts targeting these specific memory safety vulnerabilities in their environments.