CVE-2026-101976 Junos OS and Junos OS Evolved: In a non-4byte-AS scenario a specific BGP update causes an rpd crash
A remote attacker can crash the routing daemon by sending a malformed BGP update, causing a denial of service on Juniper network devices.
- 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-2026-101976?
CVE-2026-101976 is a high-severity 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
An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an eBGP peer which has not negotiated four-octet-AS capability sending a specifically malformed BGP update to cause a Denial-of-Service (DoS).
Weakness: CWE-787
Which versions are affected by CVE-2026-101976?
How do I fix CVE-2026-101976?
No fix has been published for CVE-2026-101976 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-2026-101976 being exploited?
There is no known exploitation of CVE-2026-101976 in the wild and no public exploit code.
Sources
Also known as GHSA-f96g-6rpj-2gwj.