Is CVE-2026-77178 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-77178 being exploited in the wild.

How severe is CVE-2026-77178?

Informational severity, published 6 October 2026.

Which products and versions are affected?

Oracle Vm Virtualbox before 7.2.8.

Is there a fix for CVE-2026-77178?

Yes: fixed in 7.2.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-77178 attacked?

It is attacked from the adjacent network, in a network appliance.

Am I affected by CVE-2026-77178?

Check whether you run Oracle Vm Virtualbox at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-77178: Oracle VM VirtualBox heap out-of-bounds write in PCNet emulation

CVE-2026-77178 · Severity: info · Published 2026-10-06

Oracle VM VirtualBox's PCNet network device emulation contains a heap memory vulnerability that allows a malicious guest operating system to write data past a buffer boundary in the host process. An attacker with control of a guest VM can corrupt adjacent host memory, potentially leading to host system compromise or denial of service. This is a guest-to-host privilege escalation vector in virtualized environments.

Technologies: Oracle Vm Virtualbox. Vendors: Oracle.

Quick answers

Is CVE-2026-77178 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-77178 being exploited in the wild.
How severe is CVE-2026-77178?: Informational severity, published 6 October 2026.
Which products and versions are affected?: Oracle Vm Virtualbox before 7.2.8.
Is there a fix for CVE-2026-77178?: Yes: fixed in 7.2.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-77178 attacked?: It is attacked from the adjacent network, in a network appliance.
Am I affected by CVE-2026-77178?: Check whether you run Oracle Vm Virtualbox at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 7.2.8

Technical details

The vulnerability is a bounded heap out-of-bounds write in the pcnetReceiveNoSync function (DevPCNet.cpp) of the PCNet (Am79C970A) network device model. A guest can exploit internal loopback mode with chained transmit descriptors to send a 4096-byte frame into a 4088-byte receive buffer (positioned at offset +8), causing guest-controlled data to overwrite adjacent device state. The flaw was fixed in version 7.2.8 by repositioning the write cursor to the buffer base.

Affected products

Oracle VM VirtualBox before 7.2.8

Timeline

2026-10-06: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.