# CVE-2026-18832: IBM AIX and PowerVM VIOS heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-18832-ibm-aix-and-powervm-vios-heap-based-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-20. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-18832 · Severity: high · CVSS 8.8 · Published 2026-08-20

IBM AIX and PowerVM VIOS are enterprise operating systems and virtualization platforms used to manage critical business infrastructure. A remote attacker can trigger a heap-based buffer overflow to execute arbitrary code on affected systems, potentially compromising the entire infrastructure stack and all workloads running on it.

Technologies: [IBM Aix](https://junglewise.ai/threats/technologies/aix), [IBM PowerVM VIOS](https://junglewise.ai/threats/technologies/powervm-vios). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-18832 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18832 being exploited in the wild.

**How severe is CVE-2026-18832?** High severity, with a CVSS score of 8.8, 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-2026-18832?** 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-2026-18832 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-18832?** 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

The vulnerability is a heap-based buffer overflow in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1 that allows remote code execution. The attack vector is network-based with no authentication or user interaction required. Successful exploitation permits an attacker to execute arbitrary code at the privilege level of the vulnerable service, potentially leading to full system compromise. IBM has released security updates through Service Packs and Fix Packs to remediate this vulnerability.

## Affected products

- IBM AIX 7.2, 7.3
- IBM PowerVM VIOS 4.1

## Timeline

- 2026-08-20: disclosed

## References

- [https://www.ibm.com/support/pages/node/7283858](https://www.ibm.com/support/pages/node/7283858)

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