CVE-2026-33789 Memory corruption in Junos OS
An unauthenticated BGP peer can cause denial of service or root-level code execution via crafted updates when BMP is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-33789?
CVE-2026-33789 is a critical memory corruption vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A Stack-based Buffer Overflow vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated BGP peer to cause a denial of service and potential root-level command execution via crafted BGP route updates when the BGP Monitoring Protocol (BMP) is enabled.
Weakness: CWE-121
Which versions are affected by CVE-2026-33789?
How do I fix CVE-2026-33789?
No fix has been published for CVE-2026-33789 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-2026-33789 being exploited?
There is no known exploitation of CVE-2026-33789 in the wild and no public exploit code.
Sources
Also known as GHSA-6wm5-v698-ppc6.