CVE-2026-105959

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

State: Published
Severity: 7.5 High
Published: Oct 16, 2026
Updated: Oct 20, 2026
Reserved: Oct 6, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 8Red Hat

References

https://access.redhat.com/security/cve/CVE-2026-105959vdb-entry
RHBZ#2554008issue-tracking
https://gitlab.freedesktop.org/spice/spice/-/merge_requests/253

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