CVE-2026-27524 in OpenClaw
Summary
by MITRE • 03/18/2026
OpenClaw versions prior to 2026.2.21 accept prototype-reserved keys in runtime /debug set override object values, allowing prototype pollution attacks. Authorized /debug set callers can inject __proto__, constructor, or prototype keys to manipulate object prototypes and bypass command gate restrictions.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 03/26/2026
CVE-2026-27524 represents a critical prototype pollution vulnerability affecting OpenClaw versions prior to 2026.2.21. This flaw resides in the runtime debugging system where the application fails to properly validate input keys during /debug set override operations. The vulnerability specifically allows unauthorized manipulation of object prototypes through the acceptance of reserved keys such as _proto_, constructor, and prototype within configuration override values. The issue stems from insufficient input sanitization mechanisms that permit these prototype-reserved identifiers to be processed as legitimate configuration parameters, creating a pathway for malicious actors to manipulate the underlying object model.
The technical exploitation of this vulnerability occurs when authorized users with access to the /debug set functionality attempt to inject prototype-reserved keys into override values. When these keys are processed without proper validation, they can alter the prototype chain of objects within the application's memory space. This manipulation enables attackers to inject malicious properties or methods into the prototype objects themselves, potentially affecting all instances that inherit from those prototypes. The vulnerability specifically targets the runtime configuration system where debug overrides are applied, making it particularly dangerous as it operates within the application's trusted execution environment.
The operational impact of this prototype pollution vulnerability extends beyond simple configuration manipulation, creating potential pathways for privilege escalation and code execution. An attacker who can successfully inject prototype pollution can potentially bypass command gate restrictions and access functionality that should be restricted to authorized users only. This type of vulnerability aligns with CWE-471, which describes the improper handling of prototype pollution in object-oriented languages. The attack surface is particularly concerning because it leverages legitimate debugging functionality to achieve unauthorized system manipulation, making detection more challenging and the attack harder to trace back to its source.
From a cybersecurity perspective, this vulnerability demonstrates a classic example of how trusted application functionality can be weaponized for malicious purposes. The attack vector specifically targets the application's debugging interface where legitimate users expect to be able to modify runtime parameters. However, the lack of proper input validation creates a security boundary that can be crossed by attackers who understand the JavaScript prototype mechanism. This vulnerability also relates to ATT&CK technique T1059.007 for JavaScript and the use of command-line interfaces to manipulate application behavior. The exploitation requires minimal privileges since it leverages existing authorized access to the debug interface, making it particularly dangerous in environments where debug functionality remains enabled in production systems.
Mitigation strategies for CVE-2026-27524 should focus on implementing comprehensive input validation for all debug override parameters, specifically filtering out prototype-reserved keys before processing. Organizations should disable or restrict access to the /debug set functionality in production environments where possible, and implement strict access controls to ensure only authorized personnel can utilize these features. The recommended fix involves updating OpenClaw to version 2026.2.21 or later, which includes proper sanitization of input keys and validation of override values. Additionally, implementing runtime monitoring for prototype modifications and establishing regular security audits of debugging interfaces can help detect and prevent exploitation attempts. Security teams should also consider implementing application-level firewalls or WAF rules that can detect and block suspicious key patterns in debug override operations.