CVE-2026-76935 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 10-00 before 13-50-31.
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Analysis
by VulDB Data Team • 10/27/2026
The vulnerability identified within the Fujitsu PrimeJobs Automatic Job Management System, specifically affecting version 3 prior to build 13-50-31 in its Manager component, represents a critical stack-based buffer overflow condition. This type of flaw arises when an application writes more data to a fixed-size block of memory on the call stack than it is allocated to hold. In the context of enterprise job scheduling systems like JP1/Automatic Job Management System 3, such vulnerabilities are particularly severe because these platforms often operate with high privileges and handle sensitive operational workflows across distributed environments. The Manager component serves as the central control point for defining, monitoring, and executing jobs, making it a prime target for attackers seeking to disrupt business continuity or gain unauthorized access to underlying infrastructure.
From a technical perspective, stack-based buffer overflows typically occur when input validation is insufficient or absent during the processing of specific requests or data structures passed to the vulnerable function. When an attacker supplies crafted input that exceeds the expected buffer length, the excess data spills over into adjacent memory locations on the stack. This overflow can overwrite critical return addresses and saved frame pointers, allowing the attacker to redirect the flow of execution. By carefully crafting the payload, a malicious actor can execute arbitrary code within the context of the vulnerable process. Given that job management systems often run as system services or with elevated permissions to interact with operating system resources, successful exploitation could lead to complete compromise of the host machine, including access to stored credentials, configuration files, and other sensitive data managed by the scheduler.
The operational impact of this vulnerability extends beyond simple code execution. A successfully exploited buffer overflow in a job management console can result in denial of service through application crashes or system instability, disrupting critical automated workflows that organizations rely on for daily operations. Furthermore, if an attacker achieves remote code execution via network-facing interfaces associated with the Manager component, they could establish persistent backdoors, pivot to other systems within the enterprise network, or exfiltrate proprietary data. The severity is compounded by the fact that these systems are often integral to business logic automation, meaning downtime directly correlates with financial loss and operational inefficiency. Security teams must recognize that this is not merely a software bug but a potential entry point for advanced persistent threats targeting industrial control systems or enterprise IT infrastructure.
Mitigation strategies should prioritize immediate patching as the primary defense vector. Fujitsu has released updates addressing this issue in version 13-50-31 and later, which include fixes to ensure proper bounds checking on all input buffers handled by the Manager component. Organizations running affected versions must apply these patches promptly after verifying compatibility with their existing job schedules and dependencies. In scenarios where immediate patching is not feasible due to maintenance windows or testing requirements, network-level controls should be implemented to restrict access to the vulnerable service ports from untrusted networks. Additionally, deploying intrusion detection systems configured to detect signatures associated with stack-based overflow attempts can provide an additional layer of defense. It is also advisable to review and harden the configuration of the JP1 system by disabling unnecessary services, enforcing strict authentication policies, and ensuring that the underlying operating system employs modern memory protection mechanisms such as Data Execution Prevention and Address Space Layout Randomization to mitigate the impact of any successful exploitation attempts.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-120, which classifies buffer copies without checking size limits into a destination buffer. The attack vector likely corresponds to ATT&CK technique T1190, Exploit Public-Facing Application, particularly if the Manager component is accessible over a network interface. Understanding these mappings helps security teams contextualize the risk within broader threat intelligence frameworks and prioritize remediation efforts based on industry-standard classifications of software weaknesses and adversary behaviors.