What is CVE-2026-86577?

CVE-2026-86577 is a critical-severity vulnerability in Hitachi Jp1/automatic Job Management System 3 - Agent, classified under Out-of-bounds Write. CVSS score: 9.4/10. Published 2026-10-27.

How severe is CVE-2026-86577?

Critical severity. CVSS v3 base score is 9.4 out of 10.

Buffer overflow in Hitachi Jp1/automatic Job Management System 3 - Agent

CVE-2026-86577

Out-of-bounds Write 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.

Vulnerability class: Buffer Overflow

Published 2026-10-27 · last modified 2026-10-27.

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.005 (39.4th percentile), scored 2026-10-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-155/in… (vendor-advisory)

Frequently asked questions

What is CVE-2026-86577?: CVE-2026-86577 is a critical-severity vulnerability in Hitachi Jp1/automatic Job Management System 3 - Agent, classified under Out-of-bounds Write. CVSS score: 9.4/10. Published 2026-10-27.
How severe is CVE-2026-86577?: Critical severity. CVSS v3 base score is 9.4 out of 10.