CVE-2026-105959 HIGH

CVE-2026-105959: Spice-server: spice: heap buffer overflow via glz dictionary max_encoders integer truncation

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-190
Published October 16, 2026
Last update October 16, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

A flaw was found in spice-server. The GLZ encoder dictionary restore path truncates a size_t allocation size to int when calling the malloc callback, allowing a malicious authenticated SPICE client during VM live migration to trigger a massive heap buffer overflow by sending a crafted max_encoders value in migration data.

Key dates

02Disclosure timeline

October 16, 2026 CVE published