CVE-2026-2773 is a security vulnerability identified in the Web Audio component of Mozilla Firefox. The root cause is incorrect boundary condition checks within the Web Audio API implementation, which can lead to memory corruption. This flaw affects all Firefox versions prior to 148 and Extended Support Release (ESR) versions prior to 115.33 and 140.8. Memory corruption vulnerabilities in browser components are critical because they can be exploited by attackers to execute arbitrary code within the context of the browser process, potentially leading to full system compromise or sandbox escape. The Web Audio API is widely used for processing and synthesizing audio in web applications, so malicious web content could exploit this vulnerability by crafting specially designed audio data or scripts. Although no known exploits have been reported in the wild, the nature of the vulnerability suggests that exploitation could be straightforward for attackers with web access to victims. The absence of a CVSS score means severity must be assessed based on impact and exploitability factors. Given the potential for arbitrary code execution and the broad user base of Firefox, this vulnerability represents a significant risk to confidentiality, integrity, and availability of affected systems. Mozilla has published the vulnerability details but no direct patch links are provided in the source, indicating that users should upgrade to Firefox 148 or ESR versions 115.33 or 140.8 and later once available.

The potential impact of CVE-2026-2773 is substantial for organizations worldwide. Successful exploitation could allow attackers to execute arbitrary code within the browser context, leading to data theft, installation of malware, or lateral movement within networks. This could compromise user credentials, sensitive information, and internal systems. Additionally, exploitation could cause denial of service by crashing the browser, disrupting business operations. Given Firefox's significant market share in both consumer and enterprise environments, many organizations are at risk, especially those relying on Firefox for web access to critical applications. The vulnerability also poses risks to users in high-security environments such as government, finance, and healthcare sectors where browser security is paramount. The lack of known exploits currently provides a window for proactive mitigation, but the vulnerability's nature means attackers could develop exploits rapidly once details are public.

Organizations should immediately plan to upgrade affected Firefox versions to 148 or later, or ESR versions 115.33 or 140.8 and beyond as soon as patches are available. Until upgrades are applied, users should be advised to avoid untrusted or suspicious websites, especially those that might serve malicious audio content. Network-level protections such as web filtering and intrusion detection systems should be tuned to detect and block exploit attempts targeting the Web Audio API. Security teams should monitor threat intelligence sources for emerging exploit code or attack campaigns related to this vulnerability. Employing browser sandboxing and endpoint protection solutions can help contain potential exploitation impacts. Additionally, organizations should review and tighten browser security configurations, disable unnecessary plugins or features related to audio processing if feasible, and educate users about phishing and drive-by download risks. Maintaining up-to-date backups and incident response plans will aid recovery if exploitation occurs.