CVE-2026-103993 Memory corruption in Junos OS
An adjacent attacker can crash the routing daemon by sending specific BGP communities, causing a denial of service on Juniper devices.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103993?
CVE-2026-103993 is a medium-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
An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker which sends a specific set of BGP communities to cause a Denial-of-Service (DoS) as rpd crashes when graceful-shutdown sender community is added when attempting to advertise.
Weakness: CWE-787
Which versions are affected by CVE-2026-103993?
How do I fix CVE-2026-103993?
No fix has been published for CVE-2026-103993 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-2026-103993 being exploited?
There is no known exploitation of CVE-2026-103993 in the wild and no public exploit code.
Sources
Also known as GHSA-3vcp-3vfh-hjrh.