What is CVE-2026-105959?

CVE-2026-105959 is a high-severity vulnerability in Red Hat Enterprise Linux 6, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-10-16.

How severe is CVE-2026-105959?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Red Hat Enterprise Linux 6

CVE-2026-105959

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.

Vulnerability class: Integer Overflow

Published 2026-10-16 · last modified 2026-10-16.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

access.redhat.com/security/cve/CVE-2026-105959 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)
gitlab.freedesktop.org/spice/spice/-/merge_requests/253

Frequently asked questions

What is CVE-2026-105959?: CVE-2026-105959 is a high-severity vulnerability in Red Hat Enterprise Linux 6, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-10-16.
How severe is CVE-2026-105959?: High severity. CVSS v3 base score is 7.5 out of 10.