Quick answers
- Is CVE-2026-18670 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18670 being exploited in the wild.
- How severe is CVE-2026-18670?
- High severity, with a CVSS score of 8.2, 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-2026-18670?
- 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-2026-18670 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-18670?
- 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 an integer underflow flaw in IBM AIX 7.2, 7.3 and PowerVM VIOS 4.1 that can be exploited remotely without authentication. An attacker can trigger the integer underflow to cause a denial of service condition and potentially disclose sensitive information from memory or data structures. The exact vulnerable component is not specified in the advisory, but the network-accessible attack surface combined with no authentication requirement makes this a significant risk. IBM has released security updates through Service Packs and Fix Packs to remediate the vulnerability.
Affected products
- IBM AIX 7.2, 7.3
- IBM PowerVM VIOS 4.1
Timeline
- 2026-08-20: disclosed