Critical severity · published Oct 27, 2026
CVE-2026-86574
Heap-based Buffer Overflow Vulnerability in JP1/Base
New
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
Heap-based Buffer Overflow Vulnerability in JP1/Base.
This issue affects JP1/Base: from 11-00 before 12-50-54.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JP
JP1/Base · Hitachi
11-00 before 12-50-54 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86574
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86574
www.hitachi.com
https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-156/index.html
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