CVE-2026-101985 Junos OS Evolved: PTX Series: An IS-IS peer causes an rpd crash when BIER over IS-IS is enabled
An unauthenticated IS-IS peer can crash the routing daemon on PTX Series devices when BIER over IS-IS is enabled, causing 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-2026-101985?
CVE-2026-101985 is a high-severity denial of service vulnerability in Juniper Networks Junos OS Evolved, 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 Improper Validation of Specified Quantity in Input vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated IS-IS peer to cause a denial of service.
Weakness: CWE-1284
Which versions are affected by CVE-2026-101985?
How do I fix CVE-2026-101985?
No fix has been published for CVE-2026-101985 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-2026-101985 being exploited?
There is no known exploitation of CVE-2026-101985 in the wild and no public exploit code.
Sources
Also known as GHSA-rrw4-c99g-5p92.