CVE-2026-25360 in Vex Plugin
Summary
by MITRE • 03/25/2026
Deserialization of Untrusted Data vulnerability in rascals Vex vex allows Object Injection.This issue affects Vex: from n/a through < 1.2.9.
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Analysis
by VulDB Data Team • 03/31/2026
The CVE-2026-25360 vulnerability represents a critical deserialization flaw in the rascals Vex vex library that enables object injection attacks. This vulnerability falls under the CWE-502 category, which specifically addresses deserialization of untrusted data, making it a well-documented and dangerous class of security weakness. The flaw exists within the Vex library version range starting from n/a through versions prior to 1.2.9, indicating that any system utilizing these vulnerable versions is at risk of exploitation. The vulnerability stems from the library's improper handling of serialized data objects, allowing malicious actors to inject arbitrary objects during the deserialization process.
The technical implementation of this vulnerability occurs when the Vex library processes serialized data without adequate validation or sanitization of the input. During deserialization, the system attempts to reconstruct objects from serialized representations, but fails to verify the integrity or origin of these data structures. This creates an opportunity for attackers to craft malicious serialized objects that, when processed by the vulnerable library, can execute arbitrary code or manipulate the application's behavior. The object injection mechanism typically leverages the deserialization process to bypass normal access controls and potentially elevate privileges or gain unauthorized system access.
Operationally, this vulnerability poses significant risks to systems that rely on the Vex library for data processing or object management. Attackers could exploit this weakness to perform remote code execution, data manipulation, or denial of service attacks depending on how the vulnerable system handles the deserialized objects. The impact extends beyond simple data corruption as the injection could lead to complete system compromise, especially if the affected application runs with elevated privileges. Organizations using vulnerable versions of Vex may experience unauthorized access to sensitive data, system availability issues, or potential lateral movement within network environments where the library is deployed.
Mitigation strategies for CVE-2026-25360 should prioritize immediate patching of the Vex library to version 1.2.9 or later, which contains the necessary fixes to prevent object injection during deserialization. System administrators should implement strict input validation measures and consider using alternative serialization formats that are less prone to injection attacks. The ATT&CK framework categorizes this type of vulnerability under T1059.007 for script-based execution and potentially T1203 for exploitation of remote services, making it a critical target for defensive security measures. Additional protective measures include network segmentation, monitoring for unusual deserialization patterns, and implementing application whitelisting to restrict which serialized objects can be processed by the vulnerable library.