What’s Vulnerable › Vulnerabilities

CVE-2026-105959: Spice-server: spice: heap buffer overflow via glz dictionary max_encoders integer truncation

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-16
• Weakness: CWE-190

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.

Affected products

• Red Hat Enterprise Linux 6: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions

References

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

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