What is CVE-2026-16883?

CVE-2026-16883 is a medium-severity vulnerability in IBM Aix, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-08-19.

How severe is CVE-2026-16883?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Out-of-bounds Read in IBM Aix

CVE-2026-16883

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to obtain sensitive information due to an out-of-bounds read.

Vulnerability class: Buffer Overflow

Published 2026-08-19 · last modified 2026-08-20.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (3.3th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

IBM Aix — versions 7.2, 7.3
IBM Powervm Vios — versions 4.1
IBM Vios

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

www.ibm.com/support/pages/node/7283858 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-16883?: CVE-2026-16883 is a medium-severity vulnerability in IBM Aix, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-08-19.
How severe is CVE-2026-16883?: Medium severity. CVSS v3 base score is 5.5 out of 10.