CVE-2026-15719 in Firefox
Summary
by MITRE • 07/14/2026
We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical security flaw that has been publicly documented and patched in Mozilla Firefox version 152.0.6, though no confirmed instances of exploitation in the wild have been reported to date. The issue stems from a fundamental weakness in how the browser handles certain memory operations during web page rendering processes, creating potential attack vectors for malicious actors who could leverage this flaw to execute arbitrary code on affected systems. The vulnerability manifests when the browser encounters specific combinations of web content that trigger improper memory management behaviors, potentially allowing attackers to manipulate memory pointers or corrupt data structures within the browser's execution environment.
The technical implementation of this vulnerability involves a classic memory safety issue that falls under the category of buffer overflows or use-after-free conditions, which are commonly classified as CWE-121 or CWE-416 depending on the specific manifestation. Attackers could potentially craft malicious web pages containing specially formatted JavaScript or HTML elements that would cause the browser to allocate or deallocate memory in unexpected ways, leading to potential code execution privileges. The flaw operates at a low level within the browser's rendering engine where memory management decisions are made during page processing, making it particularly dangerous as it can be exploited through standard web browsing activities without requiring any special privileges or user interaction beyond visiting a compromised website.
The operational impact of this vulnerability extends beyond simple browser compromise, as successful exploitation could enable attackers to establish persistent access to affected systems, potentially leading to data theft, system control, or further network infiltration. The attack surface is significant given that modern browsers are frequently targeted due to their privileged position in executing complex web content and their direct interaction with system resources. Security researchers have identified that the vulnerability's exploitability increases when users visit malicious websites or open compromised email attachments containing embedded web content, making it a particularly concerning threat for organizations where employees regularly access untrusted web content.
Organizations should prioritize immediate deployment of Firefox version 152.0.6 across all affected systems to mitigate this risk, as the patch addresses the underlying memory management flaw that enables exploitation. Additional protective measures include implementing browser hardening configurations such as disabling unnecessary plugins, enabling strict Content Security Policies, and deploying web application firewalls to monitor for suspicious traffic patterns. Security teams should also consider implementing network-based detection mechanisms that can identify potential exploitation attempts through anomalous memory access patterns or unusual browser behavior. The vulnerability's classification under ATT&CK framework would likely map to techniques involving privilege escalation and execution through web browsers, emphasizing the need for comprehensive security monitoring and incident response procedures. Regular security assessments should be conducted to ensure proper patch management and to validate that all browser instances are running patched versions to prevent exploitation attempts.