---
id: "CVE-2026-17073"
kind: "vulnerability"
aliases: ["CVE-2026-17073"]
title: "IBM i: missing subtree checks let local users read sensitive files"
severity: "medium"
cvss: 5.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "ibm i", "fixed": [], "affected": "= 7.3", "ecosystem": "vendor"}, {"name": "ibm i", "fixed": [], "affected": "= 7.4", "ecosystem": "vendor"}, {"name": "ibm i", "fixed": [], "affected": "= 7.5", "ecosystem": "vendor"}, {"name": "ibm i", "fixed": [], "affected": "= 7.6", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["ibm-i", "infrastructure", "power-systems"]
not_affected_if: ["no-local-access"]
published_at: "2026-10-16T19:17:06+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-25T04:14:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17073", "first_seen_at": "2026-10-23T21:57:14+00:00"}]
---

# IBM i: missing subtree checks let local users read sensitive files

IBM i versions 7.3 through 7.6 do not perform subtree checks when resolving file handles. A local attacker can use this to obtain sensitive information they should not be able to read.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:ibm i affected = 7.3 fixed ?
- vendor:ibm i affected = 7.4 fixed ?
- vendor:ibm i affected = 7.5 fixed ?
- vendor:ibm i affected = 7.6 fixed ?

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-17073

## From the sources

IBM i 7.3, 7.4, 7.5, and 7.6 could allow a local attacker to obtain sensitive information due to missing subtree checks during file handle resolution.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_