CVE-2026-18828: CWE-787 Out-of-bounds Write in IBM AIX
Description
CVE-2026-18828 is a medium severity vulnerability affecting IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. It involves a stack-based buffer overflow that could be triggered remotely, potentially causing a denial of service. The vulnerability does not require user interaction or privileges to exploit. No known exploits are reported in the wild, and no official patch information is provided.
CVSS v3.1
Score 5.4medium
Affected software
IBM
AIX
IBM
PowerVM VIOS
cpe:2.3:a:ibm:aix:7.2:*:*:*:*:*:*:*cpe:2.3:a:ibm:aix:7.2.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:aix:7.3:*:*:*:*:*:*:*cpe:2.3:a:ibm:aix:7.3.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_vios:4.1:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_vios:4.1.0:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-18828) is a stack-based buffer overflow (CWE-787) in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. A remote attacker could exploit this flaw to cause a denial of service condition. The CVSS 3.1 base score is 5.4 (medium), with attack vector being adjacent network, low attack complexity, no privileges required, no user interaction, and limited confidentiality and availability impact.
Potential Impact
Successful exploitation could lead to denial of service by crashing the affected system due to a stack-based buffer overflow. Confidentiality and integrity impacts are minimal or none. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, monitor IBM advisories for updates and consider limiting exposure of affected systems to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-08-04T13:58:07.119Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a877ac7acd9273b493025f5
Added to database: 08/20/2026, 22:08:07 UTC
Last enriched: 09/11/2026, 03:47:53 UTC
Last updated: 10/05/2026, 06:48:14 UTC
Views: 103
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