Description

A security flaw has been discovered in lenve vhr 1.0-SNAPSHOT. This issue affects some unknown processing of the component MailReceiver. Performing a manipulation results in deserialization. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.3",
  "pubDate": "2026-09-13T01:16:37.520Z",
  "pubdate": "2026-09-13T01:16:37.520Z",
  "executiveSummary": "A critical deserialization vulnerability has been identified within the MailReceiver component of lenve vhr 1.0-SNAPSHOT.\nThis flaw allows for remote code execution by processing malicious serialized objects, posing a severe risk to system integrity and data confidentiality.\nThe vulnerability exists because the application improperly deserializes untrusted data without adequate validation or sanitization, potentially permitting an unauthenticated remote attacker to execute arbitrary code with the privileges of the application process.\nThe exploit is publicly available, increasing the likelihood of exploitation in active environments.\nSince the vendor has not provided a patch or formal response, systems running this specific version remain highly susceptible to malicious activity.\nOrganizations utilizing this software are advised to implement immediate network-level access controls to restrict exposure of the affected component.",
  "technicalDetails": "The vulnerability resides in the MailReceiver component of lenve vhr 1.0-SNAPSHOT, specifically during the handling of incoming data streams that are subject to Java deserialization. The root cause is the reliance on insecure deserialization mechanisms where the application reconstructs object graphs from serialized byte streams provided by an external source without implementing a look-ahead filter or utilizing safe deserialization practices.\nAn attacker can exploit this by crafting a malicious serialized object containing a payload designed to leverage gadget chains present in the application's classpath. When the MailReceiver component processes this object, the Java Virtual Machine (JVM) triggers the deserialization process. During this sequence, the application invokes methods associated with the deserialized objects—such as readObject()—which can lead to the instantiation of classes and execution of arbitrary code defined by the attacker.\nThe attack flow begins with the attacker identifying a network endpoint or interface that communicates with the MailReceiver component. Since the interface is remotely accessible, the attacker transmits a specially crafted serialized object stream to the target. Upon receipt, the vulnerable component attempts to deserialize the payload without validation. If the payload contains a weaponized gadget chain, the application is forced to execute arbitrary commands or operations on the underlying host OS. This essentially bypasses standard application-layer security controls, as the malicious actions occur within the context of the running application process.\nGiven the public availability of the exploit, the barrier to entry for potential adversaries is significantly lowered. The vulnerability does not appear to require prior authentication, meaning the attack vector is exposed to any network entity capable of reaching the MailReceiver interface. The impact of successful exploitation is typically total system compromise, including the ability to exfiltrate sensitive data, install persistent backdoors, or pivot further into the internal network infrastructure. Because there is no vendor-provided patch, the vulnerability remains permanently present in the 1.0-SNAPSHOT release."
}