CVE-2026-101987 Junos OS and Junos OS Evolved: A specific IS-IS SRv6 packet causes an rpd crash when flexible algorithm is used
An adjacent attacker can crash the routing daemon by sending a specific IS-IS SRv6 packet when Flexible Algorithm is enabled.
- 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-2026-101987?
CVE-2026-101987 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
An Improper Validation of Specified Quantity in Input vulnerability in the routing daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to cause a denial of service by sending a specific IS-IS SRv6 packet when SRv6 and Flexible Algorithm are enabled.
Weakness: CWE-1284
Which versions are affected by CVE-2026-101987?
How do I fix CVE-2026-101987?
No fix has been published for CVE-2026-101987 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-2026-101987 being exploited?
There is no known exploitation of CVE-2026-101987 in the wild and no public exploit code.
Sources
Also known as GHSA-286m-f46f-v69m.