What is CVE-2026-16887?

CVE-2026-16887 is a high-severity vulnerability in IBM I, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-08-13.

How severe is CVE-2026-16887?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in IBM I

CVE-2026-16887

IBM i 7.6 could allow a remote attacker to cause a denial of service due to an out-of-bounds write.

Vulnerability class: Buffer Overflow

Published 2026-08-13 · last modified 2026-08-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (43.7th percentile), scored 2026-09-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.002

Affected products

IBM I — versions 7.6

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.ibm.com/support/pages/node/7283319 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-16887?: CVE-2026-16887 is a high-severity vulnerability in IBM I, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-08-13.
How severe is CVE-2026-16887?: High severity. CVSS v3 base score is 7.5 out of 10.