Quick answers
- Is CVE-2026-17491 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-17491 being exploited in the wild.
- How severe is CVE-2026-17491?
- Medium severity, with a CVSS score of 5.4, published 16 October 2026.
- Which products and versions are affected?
- IBM I 7.3, 7.4, 7.5, 7.6.
- Is there a fix for CVE-2026-17491?
- Yes: fixed in IBM i 7.6 PTF SJ11849, 7.5 PTF SJ11850, 7.4 PTF SJ11852, 7.3 PTF SJ11852. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-17491 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-17491?
- 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.
How to fix
- Fixed in: IBM i 7.6 PTF SJ11849, 7.5 PTF SJ11850, 7.4 PTF SJ11852, 7.3 PTF SJ11852
Technical details
The vulnerability is an improper privilege management flaw (CWE-269) in OpenSSH's ChrootDirectory configuration enforcement on IBM i. A remote authenticated attacker with SSH credentials can bypass chroot restrictions through a network connection without user interaction (CVSS vector AV:N/AC:L/PR:L/UI:N). Exploitation allows limited confidentiality and integrity impact. Patches are available as PTFs (SJ11849, SJ11850, SJ11852).
Affected products
- IBM i 7.3, 7.4, 7.5, 7.6
Timeline
- 2026-10-13: disclosed: Initial publication of security bulletin