Hitachi JP1/Automatic Job Management System 3: Stack-based buffer overflow
Summary
A stack-based buffer overflow (CWE-121) in the Manager component of Hitachi JP1/Automatic Job Management System 3 (JP1/AJS3) allows an attacker to overwrite memory on the stack. The CVSS vector (AV:N/AC:L/PR:N/UI:N) indicates that the flaw can be triggered over the network without authentication or user interaction, with high impact on confidentiality and integrity and low impact on availability. The Agent is not covered by this CVE.
Affected
- JP1/Automatic Job Management System 3 - Manager, versions 10-00 up to but not including 13-50-31 (per the CVE record)
Vendor version lists cover Windows, Linux, AIX, HP-UX and Solaris.
Agent: not covered by CVE-2026-76936; check Agent installations separately.
Fixed in
- Windows and Linux: 13-50-31, 12-60-53, 11-50-39
- AIX, HP-UX and Solaris: 12-60-53, 11-50-39
- Other branches: contact Hitachi support for details.
Workaround
Unknown.
Exploitation
- Not known to be exploited (OffSeq).
- No CISA KEV listing found; not confirmed and not ruled out.
- No public proof of concept found.
- EPSS: 0.45 % (percentile 39).
Our recommendation
- Inventory all JP1/AJS3 Manager and Agent installations and their versions.
- Upgrade Manager installations to the fixed version for their platform, at least 13-50-31 on Windows and Linux.
- Restrict network access to the Manager to known management hosts.
- Check whether Manager ports are reachable from the internet or untrusted segments.
- Monitor for unusual job creation or changes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Hitachi vendor advisory HITACHI-SEC-2026-142 www.hitachi.com
- VulDB CVE-2026-76936 entry vuldb.com
- OffSeq Radar CVE-2026-76936 radar.offseq.com
- Strix CVE-2026-76936 www.strix.ai
- Hitachi JP1/AJS3 product page www.hitachi.asia
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, 23:47.
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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