CVE-2026-75987 in esProc
Summary
by MITRE • 08/19/2026
A vulnerability was found in SPLWare esProc up to 20260507. This affects the function ObjectInputStream.readUnshared of the file src/main/java/com/scudata/parallel/SocketData.java. Performing a manipulation results in deserialization. Remote exploitation of the attack is possible.
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Analysis
by VulDB Data Team • 08/19/2026
The vulnerability identified in SPLWare esProc prior to version 20260507 represents a critical security flaw rooted in improper handling of Java object serialization, specifically within the SocketData.java component. The core issue resides in the usage of java.io.ObjectInputStream.readUnshared method during network communication processes. While readUnshared is designed as an alternative to readObject with certain restrictions on deserializing shared objects and circular references, it does not inherently prevent the instantiation of arbitrary classes provided they are present in the classpath. This architectural oversight allows attackers to craft malicious serialized payloads that bypass standard security checks when transmitted over the network interface exposed by esProc services.
From a technical perspective, this flaw is classified under CWE-502, which denotes Deserialization of Untrusted Data. The vulnerability arises because the application accepts input from remote sources and passes it directly into an object deserialization mechanism without implementing adequate validation or filtering mechanisms for the types of objects being instantiated. In Java environments, deserializing untrusted data can lead to Remote Code Execution if the payload contains gadgets that exploit existing libraries in the runtime environment. The presence of this function within a parallel processing module suggests that high-volume or concurrent requests might trigger the vulnerability more readily, potentially amplifying the impact through resource exhaustion or rapid execution of malicious code paths.
The operational impact of this vulnerability is severe due to its remote exploitable nature. An attacker who can interact with the esProc service over the network does not require prior authentication in many default configurations, allowing for unauthenticated access. By sending a specially crafted serialized object, an adversary could achieve arbitrary command execution on the host system running the vulnerable version of SPLWare esProc. This compromises the confidentiality, integrity, and availability of the affected systems. In enterprise environments where esProc is used for data integration or analytics, such exploitation could serve as an initial foothold for lateral movement within a network, leading to broader systemic compromise.
This vulnerability aligns with MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter sub-techniques often associated with Java-based exploits like Gadget chains from libraries such as Apache Commons Collections or Spring Framework. The attack vector corresponds to Network (T1071) for delivery of the malicious payload via standard network protocols supported by esProc services. Defense-in-depth strategies are essential here, given that purely application-level fixes may be delayed until a new version is released.
Mitigation efforts should prioritize immediate isolation of affected systems from untrusted networks if possible. Organizations must ensure they upgrade to SPLWare esProc version 20260507 or later as soon as it becomes available, as this release addresses the underlying deserialization logic flaws. In the interim, network segmentation and strict firewall rules restricting access to esProc ports should be enforced. Additionally, implementing Java Security Manager configurations with restrictive policy files can limit the actions of newly instantiated objects during deserialization. Deploying Web Application Firewalls (WAF) or intrusion detection systems capable of identifying serialized payload patterns may also provide a layer of defense against exploitation attempts while patching is underway. Regular audits of third-party dependencies and their serialization handling practices are recommended to prevent similar issues in future updates.