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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

This vulnerability is only exploitable during VM live migration by an authenticated SPICE client. If live migration is not required, disabling it eliminates the attack surface. If live migration is needed, restrict SPICE client connections to trusted networks using firewall rules and enforce strong authentication (TLS with mutual certificate validation, or SASL with strong credentials) to limit who can connect as a SPICE client.

History

Fri, 16 Oct 2026 12:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Spice-server: spice: heap buffer overflow via glz dictionary max_encoders integer truncation
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-190
CPEs cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-16T11:53:00.840Z

Reserved: 2026-10-06T08:37:18.542Z

Link: CVE-2026-105959

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-16T12:16:31.733

Modified: 2026-10-16T12:16:31.733

Link: CVE-2026-105959

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses