CVE-2026-2795 is a use-after-free vulnerability identified in the JavaScript garbage collection component of Mozilla Firefox versions earlier than 148. Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, leading to undefined behavior such as memory corruption. In the context of Firefox's JavaScript engine, this can allow attackers to manipulate memory to execute arbitrary code, escalate privileges, or cause the browser to crash. The vulnerability specifically resides in the garbage collection mechanism, which is responsible for automatic memory management of JavaScript objects. An attacker can craft malicious web content that triggers the use-after-free condition when the browser processes JavaScript, potentially leading to remote code execution without requiring prior authentication. Although no exploits have been reported in the wild yet, the nature of the vulnerability and the critical role of the JavaScript engine make it a high-risk issue. The affected versions are all Firefox releases before version 148, which is widely deployed across desktops and some mobile platforms. No official CVSS score has been assigned yet, and no patches or mitigation links are currently published, indicating that this is a newly disclosed vulnerability. The lack of known exploits suggests that attackers may still be developing techniques to leverage this flaw or that it was discovered through internal or third-party research. Given the complexity of the JavaScript engine and the widespread use of Firefox, this vulnerability demands prompt attention from users and administrators.

The impact of CVE-2026-2795 is potentially severe for organizations worldwide. Successful exploitation can lead to arbitrary code execution within the context of the browser, allowing attackers to bypass security controls, steal sensitive information, or install malware. This compromises confidentiality and integrity of user data accessed through Firefox. Additionally, exploitation can cause browser crashes or denial of service, affecting availability. Since Firefox is a popular browser used by individuals, enterprises, and government agencies, the vulnerability could be leveraged in targeted attacks or widespread campaigns. Organizations relying on Firefox for secure web access, especially those handling sensitive or regulated data, face increased risk. The vulnerability's remote exploitation capability means attackers can deliver payloads via malicious websites or ads, increasing the attack surface. The absence of known exploits currently provides a window for proactive mitigation, but the risk remains high due to the critical nature of the flaw and the broad user base.

To mitigate CVE-2026-2795, organizations and users should take immediate and specific actions beyond generic advice. First, monitor Mozilla's official channels for the release of security patches and apply updates to Firefox version 148 or later as soon as they become available. Until patches are released, consider disabling JavaScript execution in Firefox or using browser extensions that control script execution to reduce exposure. Employ network-level protections such as web filtering and intrusion prevention systems to block access to known malicious websites. Encourage users to avoid clicking on suspicious links or visiting untrusted sites. For enterprise environments, consider deploying alternative browsers with no known vulnerabilities or hardened configurations temporarily. Conduct security awareness training to highlight the risks of drive-by downloads and malicious web content. Additionally, implement endpoint detection and response (EDR) solutions to identify anomalous browser behaviors indicative of exploitation attempts. Regularly review browser usage policies and restrict installation of unapproved extensions that could increase risk. Finally, maintain comprehensive backups and incident response plans to quickly recover from potential breaches.