CVE-2026-102027 Junos OS and Junos OS Evolved: A configured BGP neighbor causes rpd crash when multipath next-hops are processed
A configured eBGP neighbor can crash the routing daemon via crafted updates when multipath features are enabled, causing denial of service.
- 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-2026-102027?
CVE-2026-102027 is a high-severity 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 Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a configured eBGP neighbor to cause an rpd crash via BGP labeled-unicast UPDATEs when the affected multipath features are enabled.
Weakness: CWE-131
Which versions are affected by CVE-2026-102027?
How do I fix CVE-2026-102027?
No fix has been published for CVE-2026-102027 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-102027 being exploited?
There is no known exploitation of CVE-2026-102027 in the wild and no public exploit code.
Sources
Also known as GHSA-57x6-37jg-h5f9.