Buffer overflow in IBM I

CVE-2026-18341

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to corrupt memory due to an integer underflow.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (14.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-18341: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • IBM I — versions 7.3, 7.4, 7.5

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18341?
CVE-2026-18341 is a medium-severity vulnerability in IBM I, classified under Heap-based Buffer Overflow. CVSS score: 6.3/10. Published 2026-09-04.
How severe is CVE-2026-18341?
Medium severity. CVSS v3 base score is 6.3 out of 10.