CVE-2026-103994 Junos OS: A crafted OVSDB message crashes vgd and allows remote code execution
A heap-based buffer overflow in Junos OS vgd allows remote code execution and denial of service via crafted OVSDB messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103994?
CVE-2026-103994 is a high-severity memory corruption vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Heap-based Buffer Overflow vulnerability in the VXLAN Gateway Daemon (vgd) of Juniper Networks Junos OS allows a malicious or compromised SDN-controller to cause a complete outage of the OVSDB control plane and possibly remote code execution.
Weakness: CWE-122
Which versions are affected by CVE-2026-103994?
How do I fix CVE-2026-103994?
No fix has been published for CVE-2026-103994 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-103994 being exploited?
There is no known exploitation of CVE-2026-103994 in the wild and no public exploit code.
Sources
Also known as GHSA-hm6p-fvm3-957g.