Hitachi JP1: Stack-based buffer overflow in JP1 products (CVE-2026-86575)
Summary
A stack-based buffer overflow (CWE-121) in several Hitachi JP1 products, including JP1/Integrated Management 3 - Manager, JP1/Automatic Job Management System 3 (Manager, Agent and Agent Minimal Edition) and JP1/Base, is rated critical with CVSS 9.4. According to the CVSS vector, an unauthenticated remote attacker with network access to the service can trigger the flaw without user interaction, with high impact on confidentiality and integrity and low impact on availability. The advisory does not describe the exact attack outcome beyond the vulnerability class.
Affected
- JP1/Integrated Management 3 - Manager: 13-00 to before 13-50-31
- JP1/Automatic Job Management System 3 - Manager: 13-00 to before 13-50-31
- JP1/Automatic Job Management System 3 - Agent: 13-00 to before 13-50-31
- JP1/Automatic Job Management System 3 - Agent Minimal Edition: 13-00 to before 13-50-31
- JP1/Base: 11-00 to before 12-50-54
Fixed in
- JP1/Integrated Management 3 - Manager: 13-50-31
- JP1/Automatic Job Management System 3 - Manager: 13-50-31
- JP1/Automatic Job Management System 3 - Agent: 13-50-31 (Windows, Linux); AIX 13-10-31 as listed in the advisory
- JP1/Automatic Job Management System 3 - Agent Minimal Edition: 13-50-31
- JP1/Base: 12-50-54 and 11-50-36
- Fixed builds for the 13-10, 13-11 and 13-01 release lines of other products: Unknown; check the vendor advisory.
Workaround
Unknown. The vendor's mitigation section could not be verified.
Exploitation
- No public exploit is listed by VulDB.
- No report of active exploitation of CVE-2026-86575 was found.
- EPSS at publication: 0.45 %.
Our recommendation
- Identify all JP1 components and versions, including AIX and Linux agents.
- Prioritise systems reachable from outside the internal network.
- Patch to the fixed builds in the vendor advisory, checking the per-release-line table.
- Until patched, restrict network access to the JP1 manager and agent services to known management hosts.
- Monitor for unusual connections or crashes on JP1 services.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Hitachi Security Advisory HITACHI-SEC-2026-155 www.hitachi.com
- VulDB 427089 (exploit status) vuldb.com
- VulDB 427105 (related CVE-2026-76936) vuldb.com
- OffSeq Radar: CVE-2026-86575 radar.offseq.com
- Strix: CVE-2026-86575 www.strix.ai
- ThreatInt: CVE-2026-86575 cve.threatint.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, 23:44.
Original description (NVD)
Stack-based Buffer Overflow Vulnerability in JP1 Products. This issue affects JP1/Integrated Management 3 - Manager: from 13-00 before 13-50-31; JP1/Automatic Job Management System 3 - Manager: from 13-00 before 13-50-31; JP1/Automatic Job Management System 3 - Agent: from 13-00 before 13-50-31; JP1/Automatic Job Management System 3 - Agent Minimal Edition: from 13-00 before 13-50-31; JP1/Base: from 11-00 before 12-50-54.
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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.