Quick answers
- Is CVE-2026-81858 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81858 being exploited in the wild.
- How severe is CVE-2026-81858?
- Medium severity, with a CVSS score of 5.4, published 13 October 2026.
- Which products and versions are affected?
- IBM I 7.3 7.3; IBM I 7.4 7.4; IBM I 7.5 7.5; IBM I 7.6 7.6.
- Is there a fix for CVE-2026-81858?
- Yes: fixed in IBM i 7.3 PTF SJ11619, 7.4 PTF SJ11620, 7.5 PTF SJ11621, 7.6 PTF SJ11622. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-81858 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-81858?
- Check whether you run IBM I, IBM I 7.3, IBM I 7.4 or one of the others listed 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.
How to fix
- Fixed in: IBM i 7.3 PTF SJ11619, 7.4 PTF SJ11620, 7.5 PTF SJ11621, 7.6 PTF SJ11622
Technical details
An out-of-bounds read vulnerability in IBM i's File Server allows a remote authenticated attacker to trigger a denial of service condition and obtain information. The vulnerability is accessible over the network and requires valid credentials; no user interaction is needed. Patched versions are available via PTF releases for all affected versions.
Affected products
- IBM i 7.3 7.3
- IBM i 7.4 7.4
- IBM i 7.5 7.5
- IBM i 7.6 7.6
Timeline
- 2026-09-30: disclosed