CVE-2026-16411 in Firefox
Summary
by MITRE • 07/21/2026
Memory safety bugs present in 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.
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Analysis
by VulDB Data Team • 07/21/2026
Firefox version 152 contained multiple memory safety vulnerabilities that represent significant security concerns for users and organizations relying on the browser for web navigation and content consumption. These memory safety bugs emerged as a critical class of vulnerabilities that could potentially allow attackers to execute arbitrary code on affected systems, making them particularly dangerous in enterprise and individual computing environments where browser security is paramount.
The underlying technical flaw resides in Firefox's memory management mechanisms, specifically within how the browser handles memory allocation, deallocation, and access patterns for various web content elements. These memory safety issues manifest as buffer overflows, use-after-free conditions, and other memory corruption vulnerabilities that occur when the browser processes malformed or malicious web content. The presence of evidence indicating memory corruption suggests that these bugs could lead to unpredictable behavior including crashes, data corruption, or more critically, complete system compromise when exploited by malicious actors.
The operational impact of these vulnerabilities extends beyond simple browser instability, as they create potential attack vectors for sophisticated exploitation campaigns. Attackers could craft specifically designed web pages or manipulate existing websites to trigger these memory safety bugs, potentially leading to remote code execution without user interaction or with minimal user engagement. The severity classification of these vulnerabilities is elevated due to their potential for privilege escalation and system compromise, particularly when combined with other attack techniques that leverage browser-based exploitation frameworks.
Organizations and individual users should prioritize immediate upgrade to Firefox version 153, which contains the necessary patches addressing these memory safety concerns. The fix implemented in version 153 likely includes enhanced memory management checks, improved bounds verification mechanisms, and strengthened input validation procedures that prevent the conditions leading to memory corruption. Security teams should also implement monitoring for any unusual network traffic patterns or system behaviors that might indicate exploitation attempts targeting these specific vulnerabilities, while maintaining updated threat intelligence feeds to track related attack vectors and indicators of compromise.
From a cybersecurity framework perspective, these vulnerabilities align with common weaknesses described in the CWE database under memory safety categories such as CWE-125 out-of-bounds read conditions and CWE-416 use after free conditions. The exploitation patterns would likely map to ATT&CK techniques including initial access through malicious websites and execution via remote code injection methods. Organizations should consider implementing browser hardening measures including content security policies, sandboxing configurations, and regular security assessments to further reduce risk exposure from similar memory safety vulnerabilities that may emerge in the future.