CVE-2026-4735 in chunjun
Summary
by MITRE • 03/24/2026
Deserialization of Untrusted Data vulnerability in DTStack chunjun (chunjun-core/src/main/java/com/dtstack/chunjun/util modules). This vulnerability is associated with program files GsonUtil.Java.
This issue affects chunjun: before 1.16.1.
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Analysis
by VulDB Data Team • 03/28/2026
The CVE-2026-4735 vulnerability represents a critical deserialization flaw in the DTStack chunjun data integration platform, specifically within the chunjun-core module's GsonUtil.java file. This vulnerability falls under the CWE-502 category, which encompasses deserialization of untrusted data, a well-documented security weakness that has plagued numerous applications across the industry. The flaw exists in the GsonUtil.java component that handles JSON serialization and deserialization operations, making it a prime target for attackers seeking to exploit the platform's data processing capabilities.
The technical implementation of this vulnerability stems from insufficient validation of serialized data within the GsonUtil.java module. When the chunjun platform processes external data inputs through its deserialization mechanisms, it fails to properly sanitize or validate the incoming serialized objects before processing them. This weakness allows an attacker to craft malicious serialized objects that, when processed by the vulnerable Gson library, can execute arbitrary code on the target system. The vulnerability is particularly concerning because it affects the core data processing functionality of the platform, which is designed to handle various data sources and transformations in enterprise environments.
The operational impact of CVE-2026-4735 extends beyond simple code execution, as it can enable attackers to gain complete control over affected systems. In enterprise data integration environments, chunjun typically operates with elevated privileges to access and process sensitive data from multiple sources including databases, file systems, and network endpoints. This makes the vulnerability particularly dangerous as it could allow attackers to escalate privileges, access confidential data, or disrupt critical data processing workflows. The vulnerability affects all versions of chunjun prior to 1.16.1, indicating that organizations running these older versions are exposed to potential exploitation.
Mitigation strategies for this vulnerability should prioritize immediate patching to version 1.16.1 or later, which contains the necessary fixes to address the deserialization flaw. Organizations should also implement network segmentation and access controls to limit exposure of the affected components, while monitoring for suspicious deserialization activities. The ATT&CK framework categorizes this type of vulnerability under T1059.007 for command and scripting interpreter and T1210 for exploitation of remote services, emphasizing the need for both defensive measures and threat detection capabilities. Additional protective measures include implementing strict input validation, using secure deserialization libraries, and conducting regular security assessments to identify similar vulnerabilities in the platform's codebase.