What is CVE-2026-17255?

CVE-2026-17255 is a medium-severity vulnerability, classified under Out-of-bounds Write. CVSS score: 4.3/10. Published 2026-09-04.

How severe is CVE-2026-17255?

Medium severity. CVSS v3 base score is 4.3 out of 10.

CVE-2026-17255

CVE-2026-17255

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to improper validation of the prefix length in ICMPv6 Router Advertisements.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

psirt@us.ibm.com

Frequently asked questions

What is CVE-2026-17255?: CVE-2026-17255 is a medium-severity vulnerability, classified under Out-of-bounds Write. CVSS score: 4.3/10. Published 2026-09-04.
How severe is CVE-2026-17255?: Medium severity. CVSS v3 base score is 4.3 out of 10.