---
id: "CVE-2026-115501"
page: "https://infrastack.ai/live/CVE-2026-115501"
kind: "vulnerability"
aliases: ["CVE-2026-115501"]
title: "IBM i: stack buffer overflow in QFileSvr.400 file system lets local users crash or misbehave"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["as400", "ibm-i", "infrastructure"]
not_affected_if: ["no-local-accounts", "other-ibm-i-versions"]
published_at: "2026-11-13T22:17:21+00:00"
first_seen_at: "2026-11-13T22:33:34+00:00"
updated_at: "2026-11-13T22:34:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115501", "first_seen_at": "2026-11-13T22:33:34+00:00"}]
exploit_sources: []
---

# IBM i: stack buffer overflow in QFileSvr.400 file system lets local users crash or misbehave

Link for people: https://infrastack.ai/live/CVE-2026-115501 (this .md is for agents)

IBM i versions 7.3 through 7.6 have a stack buffer overflow caused by missing bounds checks in the QFileSvr.400 file system. A local attacker with valid credentials can send a crafted command that causes undefined behavior.

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

## Timeline

- 2026-11-13T22:33:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115501

## From the sources

IBM i 7.3 7.4, 7.5, and 7.6 is vulnerable to a stack buffer overflow, caused by improper bounds checking in the QFileSvr.400 file system. By sending a command in the QFileSvr.400 file system, a local authenticated attacker could cause undefined behavior.

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