Heap Buffer Overflow in Spice-Server Affects FreeDesktop
CVE-2026-105959

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
16 October 2026

What is CVE-2026-105959?

A flaw has been identified in spice-server that allows an authenticated SPICE client to exploit a weakness during virtual machine live migration. This issue arises due to the incorrect handling of memory allocation sizes, where the allocation truncates a size_t value to an int. By sending a specially crafted max_encoders value in migration data, the attacker can trigger a significant heap buffer overflow, potentially leading to arbitrary code execution and compromising the integrity of the affected system.

References

https://access.redhat.com/security/cve/CVE-2026-105959
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2554008
issue-trackingx_refsource_REDHAT
https://gitlab.freedesktop.org/spice/spice/-/merge_reques...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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