CVE-2026-2964 identifies a prototype pollution vulnerability in the higuma web-audio-recorder-js JavaScript library, specifically versions 0.1 and 0.1.1. The issue resides in the extend function within the lib/WebAudioRecorder.js file, which is responsible for dynamic configuration handling. Improper validation or control in this function allows an attacker to manipulate object prototype attributes, a classic prototype pollution scenario. This can lead to alteration of the behavior of JavaScript objects globally within the affected environment, potentially causing security issues such as bypassing security controls, altering application logic, or triggering unexpected behaviors. The vulnerability is remotely exploitable without user interaction but requires a high level of attack complexity and limited privileges, making exploitation difficult. The CVSS 4.0 score is 2.3, reflecting low severity due to the complexity and limited impact. Despite the availability of a public exploit, no active exploitation in the wild has been reported. The vendor was notified early but has not issued any response or patches, leaving users exposed. This vulnerability primarily impacts web applications or services that incorporate the affected versions of the web-audio-recorder-js library, especially those that rely on dynamic configuration features. Given the nature of prototype pollution, the risk is mainly related to integrity and potential application logic manipulation rather than direct confidentiality or availability impacts.

The impact of CVE-2026-2964 is relatively limited due to the high complexity of exploitation and the low CVSS score. However, if successfully exploited, attackers could manipulate the prototype of JavaScript objects, potentially altering application behavior or bypassing security mechanisms. This could lead to integrity issues within affected applications, such as unauthorized code execution paths or logic manipulation. Since the vulnerability is remotely exploitable without user interaction, it poses a risk to any publicly accessible service using the vulnerable library versions. The lack of vendor response and patches increases the window of exposure. Organizations using this library in production environments, especially in web applications handling sensitive data or critical audio processing, might face risks of subtle security breaches or application instability. The overall impact is mitigated by the difficulty of exploitation and the limited scope of the affected component, but it remains a concern for developers and security teams maintaining affected software.

To mitigate CVE-2026-2964, organizations should first identify all instances of the higuma web-audio-recorder-js library version 0.1 or 0.1.1 in their codebases and dependencies. Since no official patches are currently available, consider the following specific actions: 1) Implement strict input validation and sanitization around any dynamic configuration inputs passed to the extend function or similar code paths to prevent malicious prototype pollution payloads. 2) Employ runtime security controls such as Content Security Policy (CSP) and JavaScript sandboxing to limit the impact of prototype pollution. 3) Monitor application behavior for anomalies that could indicate prototype manipulation. 4) If feasible, refactor or replace the vulnerable library with a more secure alternative or a custom implementation that does not expose prototype pollution risks. 5) Maintain vigilance for any vendor updates or community patches and apply them promptly once available. 6) Conduct code reviews and security testing focusing on prototype pollution vectors in JavaScript code. These targeted mitigations go beyond generic advice by focusing on controlling dynamic configuration inputs and runtime protections specific to prototype pollution.