CVE-2026-19826 in alldata
Summary
by MITRE • 08/14/2026
A vulnerability was detected in alldatacenter alldata up to 0.6.8. This affects the function Hessian2Input.readObject of the file /serialize/impl/HessianSerializer.java of the component xxl-rpc Listener. The manipulation results in deserialization. The attack may be performed from remote. The exploit is now public and may be used. The project closed the issue report as "not planned" without any further explanation.
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Analysis
by VulDB Data Team • 08/14/2026
The vulnerability in alldatacenter alldata up to version 0.6.8 represents a critical deserialization flaw within the xxl-rpc Listener component that exposes the system to remote code execution risks. This weakness specifically manifests in the Hessian2Input.readObject method located in /serialize/impl/HessianSerializer.java, where improper input validation and object deserialization handling creates an attack vector for malicious actors. The vulnerability classification aligns with CWE-502, which addresses deserialization of untrusted data, making it particularly dangerous as it allows attackers to craft malicious serialized objects that can execute arbitrary code on the target system when processed by the vulnerable deserialization routine.
The technical implementation of this flaw stems from insufficient validation of serialized input data within the Hessian protocol processing layer. When the Hessian2Input.readObject method processes incoming serialized objects, it fails to properly sanitize or verify the integrity of the data structure before attempting to reconstruct objects from the serialized format. This oversight enables attackers to inject malicious payloads that can trigger unintended behavior during the deserialization process, potentially leading to remote code execution, privilege escalation, or complete system compromise. The attack vector is remotely exploitable, meaning that adversaries can leverage this vulnerability without requiring physical access to the target system.
The operational impact of this vulnerability extends beyond simple exploitation capabilities to encompass significant business and security implications for organizations utilizing affected versions of the software. Given that the exploit is publicly available and actively used in the wild, the window of opportunity for attackers is substantial, making immediate remediation essential. The decision by the project maintainers to close the issue report as "not planned" without providing any mitigation guidance creates additional risk for users who may be unaware of the ongoing threats. This approach contradicts industry best practices for vulnerability management and leaves affected systems vulnerable to exploitation.
Organizations should implement multiple layers of defense to mitigate this vulnerability while awaiting potential official patches or updates from the project maintainers. Network segmentation and firewall rules should be configured to restrict access to the affected service where possible, limiting the attack surface. Additionally, implementing application-level monitoring and logging around deserialization activities can help detect potential exploitation attempts. The security community recommends following ATT&CK framework techniques such as T1059.007 for remote code execution via deserialization attacks, which emphasizes the importance of input validation and secure coding practices. Organizations should also consider implementing runtime application self-protection mechanisms or using alternative serialization formats that are less prone to these types of vulnerabilities.