CVE-2026-2964 identifies a prototype pollution vulnerability in the higuma web-audio-recorder-js JavaScript library, specifically in versions 0.1 and 0.1.1. The issue resides in the extend function within lib/WebAudioRecorder.js, which handles dynamic configuration. Prototype pollution occurs when an attacker can modify the Object prototype, thereby influencing all objects inheriting from it. This can lead to unexpected behavior, data manipulation, or security bypasses in applications using the affected library. The vulnerability is exploitable remotely without user interaction but requires a high level of attack complexity and some privileges (low privileges required). The CVSS 4.0 base score is 2.3, reflecting low severity due to limited impact and difficulty of exploitation. No authentication or user interaction is required, and the vulnerability does not affect system confidentiality, integrity, or availability significantly. The vendor was contacted but did not respond, and no patches are currently available. Although an exploit exists publicly, no active exploitation in the wild has been reported. Prototype pollution vulnerabilities are dangerous in JavaScript environments because they can alter application logic globally, but in this case, the impact is constrained by the specific usage context and complexity.

The potential impact of CVE-2026-2964 is relatively low but should not be dismissed. Successful exploitation could allow attackers to manipulate the prototype of JavaScript objects used by the web-audio-recorder-js library, potentially causing unexpected application behavior, logic errors, or security bypasses in web applications that rely on this library. This could lead to minor integrity issues or denial of service if the application crashes or behaves unpredictably. However, the vulnerability does not directly expose sensitive data or allow privilege escalation. The high complexity and requirement for some privileges limit the scope of exploitation. Organizations using this library in client-side or server-side JavaScript environments might face risks if attackers can supply crafted inputs to the extend function. The lack of vendor response and absence of patches increase the risk of prolonged exposure. Overall, the threat is moderate for organizations heavily dependent on this library, especially in security-sensitive applications.

1. Immediately audit all applications using higuma web-audio-recorder-js versions 0.1 or 0.1.1 to identify usage of the extend function or dynamic configuration handling. 2. Implement input validation and sanitization to prevent untrusted data from reaching the extend function or any code paths that modify object prototypes. 3. Use JavaScript security libraries or frameworks that provide protections against prototype pollution, such as deep cloning or freezing prototypes. 4. Consider isolating or sandboxing the usage of this library to limit the impact of potential prototype pollution. 5. Monitor public repositories and advisories for any vendor patches or community fixes and apply them promptly once available. 6. If feasible, replace or upgrade the library to a version or alternative that does not contain this vulnerability. 7. Employ runtime application self-protection (RASP) or web application firewalls (WAFs) with rules targeting prototype pollution attack patterns. 8. Educate developers about the risks of prototype pollution and secure coding practices in JavaScript. These steps go beyond generic advice by focusing on code auditing, input validation, isolation, and proactive monitoring specific to this vulnerability.