CVE-2026-105959

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-190
Vendor	red hat
Product	red hat enterprise linux 6
Published	Oct 16, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Red Hat / Red Hat Enterprise Linux 6

All versions affected

Red Hat / Red Hat Enterprise Linux 7

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-105959 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2554008 gitlab.freedesktop.org: https://gitlab.freedesktop.org/spice/spice/-/merge_requests/253

Credits

Upstream acknowledges Tristan Madani (Talence Security) as the original reporter.