What is CVE-2026-62434?

CVE-2026-62434 is a medium-severity vulnerability in Xen, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2026-07-28.

How severe is CVE-2026-62434?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in Xen

CVE-2026-62434

A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest RAM. This can cause corruption of memory management state in Xen.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Xen — versions consult Xen advisory XSA-507

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security@xen.org
af854a3a-2127-422b-91ae-364da2661108
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-62434?: CVE-2026-62434 is a medium-severity vulnerability in Xen, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2026-07-28.
How severe is CVE-2026-62434?: Medium severity. CVSS v3 base score is 5.3 out of 10.