CVE-2026-33798 Junos OS and Junos OS Evolved: SRX Series: An attacker causes remote code execution when SRX chassis-cluster is enabled
An L2-adjacent attacker can execute arbitrary code as root on Juniper SRX devices via high-availability fabric traffic when chassis-cluster is enabled.
- 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-2026-33798?
CVE-2026-33798 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 Stack-based Buffer Overflow vulnerability in the srxpfe of Juniper Networks Junos OS and Junos OS Evolved on the SRX Series allows an L2-adjacent attacker to execute arbitrary code as root via high-availability fabric traffic.
Weakness: CWE-121
Which versions are affected by CVE-2026-33798?
How do I fix CVE-2026-33798?
No fix has been published for CVE-2026-33798 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-2026-33798 being exploited?
There is no known exploitation of CVE-2026-33798 in the wild and no public exploit code.
Sources
Also known as GHSA-fxrx-j3v7-6fvp.