CVE-2026-101959 Junos OS and Junos OS Evolved: A malformed LSP-ping causes an rpd crash
An unauthenticated adjacent attacker can crash the routing protocol daemon by sending malformed LSP-ping packets, 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-2026-101959?
CVE-2026-101959 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 Function Call With Incorrect Variable or Reference as Argument vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause an rpd crash via specifically malformed LSP-ping.
Weakness: CWE-688
Which versions are affected by CVE-2026-101959?
How do I fix CVE-2026-101959?
No fix has been published for CVE-2026-101959 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-2026-101959 being exploited?
There is no known exploitation of CVE-2026-101959 in the wild and no public exploit code.
Sources
Also known as GHSA-vqw7-gfmm-3mrr.