Quick answers
- Is CVE-2026-18151 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18151 being exploited in the wild.
- How severe is CVE-2026-18151?
- Medium severity, with a CVSS score of 4.2, published 14 September 2026.
- Which products and versions are affected?
- IBM I 7.3, 7.4, 7.5, 7.6.
- Is there a fix for CVE-2026-18151?
- A patch was published: PTF patches available for all affected versions (7.3, 7.4, 7.5, 7.6) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-18151 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-18151?
- Check whether you run IBM I 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 race condition (CWE-362) in the WebSocket handshake process within IBM Navigator for i. A remote authenticated attacker can exploit timing issues during the handshake to access sensitive information. The attack requires valid credentials and network access to the Navigator service, but does not require user interaction. While the CVSS score is modest (4.2), successful exploitation in a race condition context may depend on timing precision and system load conditions. IBM has released PTF patches for affected versions 7.3, 7.4, 7.5, and 7.6.
Affected products
- IBM i 7.3, 7.4, 7.5, 7.6
Timeline
- 2026-09-14: disclosed
- patched: PTF patches available for all affected versions (7.3, 7.4, 7.5, 7.6)