CVE-2025-12748 MEDIUM

CVE-2025-12748: Libvirt: denial of service in xml parsing

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-770 · Uncontrolled resource consumption
Published November 11, 2025
Last update June 29, 2026

CVSS base score

5.5/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.

Key dates

02Disclosure timeline

November 11, 2025 CVE published
June 29, 2026 Record updated