CVE-2026-2802 identifies a race condition vulnerability within the JavaScript garbage collection (GC) component of Mozilla Firefox prior to version 148. A race condition occurs when multiple threads or processes access shared data concurrently without proper synchronization, leading to inconsistent or unexpected outcomes. In this context, the flaw resides in the GC mechanism responsible for automatic memory management in JavaScript execution. Improper handling of concurrent operations during garbage collection can result in memory corruption, use-after-free conditions, or other undefined behaviors. Such memory corruption can be exploited by attackers to execute arbitrary code, escalate privileges, or cause denial of service by crashing the browser. Although the exact exploitation method is not detailed, the vulnerability likely allows an attacker to craft malicious JavaScript code that triggers the race condition during garbage collection cycles. No public exploits have been reported yet, but the vulnerability's presence in a widely used browser component makes it a significant concern. The absence of a CVSS score indicates that the vulnerability is newly disclosed, and further analysis or patching is pending. Firefox users running versions earlier than 148 are vulnerable until they apply the forthcoming security update.

The potential impact of CVE-2026-2802 is substantial for organizations worldwide that rely on Mozilla Firefox for web browsing and web-based applications. Exploitation could lead to arbitrary code execution within the browser context, enabling attackers to bypass security controls, steal sensitive information such as credentials or session tokens, or pivot to internal networks. Memory corruption could also cause browser crashes, resulting in denial of service and productivity loss. Since Firefox is commonly used in enterprise, government, and personal environments, a successful attack could compromise endpoint security and facilitate further attacks. The vulnerability affects confidentiality by exposing data, integrity by allowing unauthorized code execution, and availability by causing crashes. Organizations with high exposure to web-based threats, including financial institutions, healthcare providers, and critical infrastructure operators, face elevated risks. The lack of known exploits currently reduces immediate threat levels, but the vulnerability's nature demands proactive remediation to prevent future exploitation.

To mitigate CVE-2026-2802, organizations and users should: 1) Monitor Mozilla's official channels for the release of Firefox version 148 or later that addresses this vulnerability and apply updates promptly. 2) Until patches are available, consider restricting or disabling JavaScript execution on untrusted or less critical websites using browser extensions or enterprise policies to reduce attack surface. 3) Employ browser sandboxing and endpoint protection solutions capable of detecting anomalous behavior related to memory corruption or exploitation attempts. 4) Educate users about the risks of visiting untrusted websites or executing unverified scripts. 5) For enterprise environments, enforce strict update management policies to ensure timely deployment of security patches. 6) Review and harden browser configurations, including disabling unnecessary plugins or features that may increase exposure to JavaScript-based attacks. 7) Conduct regular security assessments and penetration testing focused on browser security to identify potential exploitation vectors. These measures, combined with prompt patching, will significantly reduce the risk posed by this vulnerability.