CVE-2026-77178 Oracle VM VirtualBox - Out of Bounds Write

Oracle VM VirtualBox < 7.2.8 contains an out-of-bounds write caused by improper handling in pcnetReceiveNoSync in DevPCNet.cpp in the PCNet network device model, letting guest OS users cause memory corruption on the host OS, exploit requires guest OS access.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Write
Impact
Out Of Bounds Rw
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
6 October 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to version 7.2.8 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs