Hitachi JP1/AJS3 Manager: Stack-based buffer overflow
Summary
A stack-based buffer overflow (CWE-121) in the Manager component of Hitachi JP1/Automatic Job Management System 3 allows an attacker to overwrite memory on the affected server. The CNA rates the flaw as network-reachable, requiring no privileges and no user interaction, with a CVSS 3.1 base score of 9.4 (Critical). Possible impact according to the vector is high confidentiality and integrity loss and low availability impact.
Affected
- JP1/Automatic Job Management System 3 - Manager, Windows and Linux
- Affected range: 13-10 to before 13-50-31 (conflicting sources; the lower bound 10-00 is also reported; verify against the Hitachi advisory)
- Fixed-products table for Agent is not part of this CVE's scope unless confirmed by the advisory
Fixed in
- Manager 13-50-31 (Windows and Linux)
- Fixed-products table for other platforms (AIX, HP-UX, Solaris) and older branches: Unknown, check the Hitachi advisory
Workaround
- No vendor workaround known.
- Interim measure: restrict network access to the Manager service to known Agent and administrator hosts until patched.
Exploitation
- Exploited in the wild: Unknown.
- CISA KEV: Not listed.
- Public proof-of-concept: None found.
- EPSS: 0.33 % (percentile 26).
Our recommendation
- Check whether JP1/AJS3 Manager is in use and which version is installed.
- Upgrade Manager to 13-50-31 or later, after verifying the fixed version in the Hitachi advisory.
- Prioritise Managers that are reachable from the internet or a DMZ.
- Restrict network access to the Manager to required Agent and admin hosts until patched.
- Patch together with other JP1 advisories published on 2026-10-27.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Hitachi Security Advisory HITACHI-SEC-2026-141 www.hitachi.com
- ThreatInt CVE-2026-76935 cve.threatint.com
- Strix CVE-2026-76935 www.strix.ai
- OffSeq Radar CVE-2026-76935 radar.offseq.com
- VulDB entry 427107 vuldb.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 30 Oct 2026, 23:46.
Original description (NVD)
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.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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