---
id: CVE-2026-86093
title: >-
  IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.5 could allow an
  attacker with the ability to control or impersonate a DRDA server endpoint to
  execute arbitrary commands on Db2 clients due to a stack-based buffer overflow
  that imp…
summary: >-
  IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.5 could allow an
  attacker with the ability to control or impersonate a DRDA server endpoint to
  execute arbitrary commands on Db2 clients due to a stack-based buffer overflow
  that imp…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
vendor: ibm
product: db2
affected:
  - 'db2 >= 11.5, <= 11.5.9'
  - 'db2 >= 12.1.0, <= 12.1.5'
published: '2026-09-10'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:10:27.400'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86093'
references:
  - url: 'https://www.ibm.com/support/pages/node/7286993'
    label: psirt@us.ibm.com
tags:
  - nvd
  - cve.org
epss: 0.00445
epssPercentile: 0.36059
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-11T00:00:00+00:00'
ingestedAt: '2026-09-14T15:23:07.483Z'
---

## Overview

IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.5 could allow an attacker with the ability to control or impersonate a DRDA server endpoint to execute arbitrary commands on Db2 clients due to a stack-based buffer overflow that improperly copies user-controlled data into a fixed-size stack buffer without bounds checking.

## Affected

- `db2 >= 11.5, <= 11.5.9`
- `db2 >= 12.1.0, <= 12.1.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.