Quick answers
- Is CVE-2026-18828 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18828 being exploited in the wild.
- How severe is CVE-2026-18828?
- Medium severity, with a CVSS score of 5.4, published 20 August 2026.
- Which products and versions are affected?
- IBM Aix 7.2, 7.3; IBM PowerVM VIOS 4.1.
- Is there a fix for CVE-2026-18828?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-18828 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-18828?
- Check whether you run IBM Aix or IBM PowerVM VIOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow exists in IBM AIX 7.2, 7.3 and PowerVM VIOS 4.1, allowing remote attackers to trigger a denial of service condition. The vulnerability is remotely exploitable without authentication or user interaction required. An attacker can send a crafted network request to overflow a stack buffer, causing the affected process to crash and resulting in availability impact. IBM has released security updates through Service Packs and Fix Packs to remediate this issue; affected systems should apply these patches promptly.
Affected products
- IBM AIX 7.2, 7.3
- IBM PowerVM VIOS 4.1
Timeline
- 2026-08-20: disclosed