CVE-2026-76934 in JP1
Summary
by MITRE • 10/27/2026
Stack-based Buffer Overflow Vulnerability in JP1/Automatic Job Management System 3.
This issue affects JP1/Automatic Job Management System 3 - Manager: from 11-00 before 13-50-31; JP1/Automatic Job Management System 3 - Agent: from 11-00 before 13-50-31.
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Analysis
by VulDB Data Team • 10/27/2026
The vulnerability identified in the Fujitsu PrimeJobs Automatic Job Management System, specifically within versions of Manager and Agent components prior to build 13-50-31 for version 11-00, represents a critical stack-based buffer overflow condition. This type of flaw occurs when a program writes more data to a fixed-length block of memory on the call stack than it is allocated to hold. In the context of enterprise job scheduling software like JP1/Automatic Job Management System, such components typically handle complex configuration inputs, command payloads, or inter-process communication messages that are processed by internal parsing routines. When these routines fail to properly validate the length of incoming data against the size of the destination buffer on the stack, an attacker can supply a specially crafted input string that exceeds the allocated space. This overflow overwrites adjacent memory locations on the stack, including critical control flow data such as return addresses and saved frame pointers.
From a technical perspective, this flaw aligns with Common Weakness Enumeration identifier CWE-121, which describes stack-based buffer overflow vulnerabilities where local variables are stored in an insufficiently sized region of the call stack. The operational impact is severe because successful exploitation allows for arbitrary code execution within the security context of the vulnerable process. If the JP1 Manager or Agent service runs with elevated privileges, as is common in enterprise infrastructure to manage system resources and execute jobs across multiple nodes, compromising these components can lead to a complete takeover of the underlying operating system. An attacker could leverage this vulnerability to install malware, create backdoors, exfiltrate sensitive data processed by the job scheduler, or use the compromised server as a pivot point for further lateral movement within the corporate network.
The attack vector likely involves sending maliciously formatted requests through the management interfaces or communication channels used between agents and managers. Since JP1 systems often operate in distributed environments with multiple nodes communicating over networks, this vulnerability may be remotely exploitable if the affected components are exposed to untrusted networks without adequate segmentation or authentication controls. The specific version constraint indicates that older builds of the 11-00 release line contain code paths where input validation logic is either missing or incorrectly implemented in functions responsible for parsing job definitions, scheduling parameters, or status reports.
Mitigation strategies must prioritize immediate patching to the specified safe build level, which is 13-50-31 or later for version 11-00 of both Manager and Agent components. Fujitsu likely released this update to address the input validation gaps that lead to the buffer overflow. In addition to applying vendor patches, organizations should implement network segmentation to restrict access to JP1 management interfaces only from authorized administrative workstations and trusted subnets. Deploying intrusion detection systems with signatures capable of detecting stack-based overflow patterns can provide an additional layer of defense by identifying anomalous traffic indicative of exploitation attempts. Furthermore, enforcing the principle of least privilege for service accounts running these components ensures that even if a buffer overflow is successfully exploited, the resulting code execution will be confined to limited permissions, thereby reducing the potential blast radius and protecting critical system resources from compromise.