# CVE-2026-17436: IBM AIX heap-based buffer overflow in NIM

Source: https://junglewise.ai/threats/cve-2026-17436-ibm-aix-heap-based-buffer-overflow-in-nim  
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-2026-17436 · Severity: high · CVSS 8.8 · Published 2026-08-20

IBM AIX and PowerVM VIOS are enterprise operating systems used to run mission-critical business applications. A heap-based buffer overflow vulnerability could allow a remote attacker to execute arbitrary code with system privileges, potentially compromising the entire server and any data or services 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-2026-17436 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-17436 being exploited in the wild.

**How severe is CVE-2026-17436?** 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-2026-17436?** 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-2026-17436 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-17436?** 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 heap-based buffer overflow exists in IBM AIX 7.2, 7.3 and PowerVM VIOS 4.1, exploitable remotely without authentication. The vulnerability is in the NIM (Network Installation Management) component. An attacker can send a specially crafted network request that triggers the buffer overflow, allowing execution of arbitrary code at the privilege level of the affected service. The vulnerability has a CVSS score of 8.8, indicating high severity with network-based attack vector and no authentication required.

## Affected products

- IBM AIX 7.2, 7.3
- IBM PowerVM VIOS 4.1

## Timeline

- 2026-08-20: disclosed
- 2026-08-21: advisory: IBM security bulletin updated

## References

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

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