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CVE-2026-16821

7.8, high

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to gain elevated privileges due to a format string vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.8, high high CVSS v3.1
EPSS, next 30 days
<0.1% higher than 0.6% of scored CVEs
Exploitation
No public evidence
Published
28 Aug 2026a month ago

Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to gain elevated privileges due to a format string vulnerability.

Details

Vendor
IBM
Product
AIX
Weakness
CWE-134 (opens in a new tab)
Status
Analyzed
Updated
2 Sept 2026
Assigner
psirt@us.ibm.com

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References 1

Patches and fixes 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other IBM CVEs

Every IBM CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-9198 IBM Langflow Code Injection Vulnerability KEV EPSS 29% 9.8, critical
  • CVE-2022-47986 IBM Aspera Faspex Code Execution Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2020-4427 IBM Data Risk Manager Security Bypass Vulnerability KEV EPSS 70% 9.8, critical
  • CVE-2020-4428 IBM Data Risk Manager Remote Code Execution Vulnerability KEV EPSS 62% 9.1, critical
  • CVE-2020-4430 IBM Data Risk Manager Directory Traversal Vulnerability KEV EPSS 69% 4.3, medium
  • CVE-2019-4716 IBM Planning Analytics Remote Code Execution Vulnerability KEV EPSS 86% 9.8, critical
  • CVE-2015-7450 IBM WebSphere Application Server and Server Hypervisor Edition Code Injection. KEV EPSS 98% 9.8, critical
  • CVE-2013-3993 IBM InfoSphere BigInsights Invalid Input Vulnerability KEV EPSS 5% 6.5, medium

Beyond this page

Is CVE-2026-16821 in your network?

This page tells you how dangerous CVE-2026-16821 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.