CVE-2026-101999 Junos OS and Junos OS Evolved: An attacker causes rpd to crash when LDP is enabled
An adjacent attacker can crash the routing process in Juniper devices by sending a specific LDP message, causing a denial of service.
- 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-2026-101999?
CVE-2026-101999 is a high-severity denial of service 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 Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos EVO allows an adjacent attacker to cause a denial of service via an established LDP session carrying an IPv6 Prefix FEC in a specific Label message.
Weakness: CWE-617
Which versions are affected by CVE-2026-101999?
How do I fix CVE-2026-101999?
No fix has been published for CVE-2026-101999 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-101999 being exploited?
There is no known exploitation of CVE-2026-101999 in the wild and no public exploit code.
Sources
Also known as GHSA-rfq4-rw8r-q64x.