CVE-2026-76933 in JP1
Summary
by MITRE • 10/27/2026
Heap-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 ranging from build 11-00 to pre-build 13-50-31, represents a critical heap-based buffer overflow condition. This type of flaw occurs when a program writes more data to a block of memory allocated on the heap than it was intended to hold. In the context of enterprise job scheduling systems like JP1, which manage complex workflows and resource allocation across distributed environments, such an error is particularly dangerous because the heap is used for dynamic memory allocation during runtime operations involving large datasets or variable-length inputs. The specific components affected are central to the system's architecture, meaning that exploitation could potentially compromise the integrity of job execution logic and control plane communications.
From a technical perspective, this vulnerability likely stems from insufficient boundary checks when processing input data within the Manager or Agent modules. When an attacker provides crafted input exceeding the expected buffer size, the excess data overwrites adjacent memory locations on the heap. This corruption can lead to arbitrary code execution if the attacker can control the overwritten data, such as function pointers or object vtables, allowing them to redirect program flow to malicious shellcode injected into the process space. The vulnerability aligns with Common Weakness Enumeration (CWE) identifier CWE-122, which describes heap-based buffer overflows that occur when a program allocates memory on the heap and fails to validate input lengths before copying data into it.
The operational impact of this vulnerability is severe due to the privileged nature of job management systems. These systems typically run with high-level privileges to interact with operating system resources, schedule tasks across multiple hosts, and manage sensitive credentials for automated workflows. Successful exploitation could allow an authenticated or network-accessible attacker to execute arbitrary code on the affected server, leading to a complete compromise of the underlying host. This could result in unauthorized access to critical business processes, data exfiltration from connected systems, or the establishment of persistent backdoors within the enterprise infrastructure. Furthermore, since JP1 often serves as an orchestrator for other security and monitoring tools, compromising it may disrupt visibility into system health and job status, hindering incident response capabilities.
In terms of threat modeling, this vulnerability maps to MITRE ATT&CK techniques related to initial access and execution via exploited remote services or local applications. Attackers could leverage this flaw during the exploitation phase to gain a foothold in the network, potentially using it as a pivot point for lateral movement toward more critical assets such as databases or domain controllers. The lack of input validation highlights a gap in secure coding practices that should be addressed through rigorous code review and static analysis tools designed to detect buffer overflow conditions before deployment.
Mitigation strategies must prioritize immediate patching by upgrading the JP1/Automatic Job Management System components to version 13-50-31 or later, where this heap-based buffer overflow has been remediated. Until patches are applied, organizations should implement strict network segmentation to limit access to the Manager and Agent interfaces from untrusted networks. Additionally, deploying intrusion detection systems with signatures capable of detecting anomalous memory allocation patterns or malformed HTTP/SOAP requests targeting these endpoints can provide an additional layer of defense. It is also advisable to enforce least-privilege principles for service accounts running JP1 components, ensuring that even if exploitation occurs, the blast radius is contained within a restricted permission set rather than full system control. Regular security assessments and penetration testing focused on input validation flaws are recommended to identify similar weaknesses in other enterprise management suites.