CVE-2026-101939 Null dereference in Junos OS
A remote attacker can cause a denial of service in the routing daemon by sending a BGP update when a specific non-existent routing table is referenced in source-based forwarding policies.
- 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-2026-101939?
CVE-2026-101939 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
A NULL Pointer Dereference vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows a configured peer sending a BGP UPDATE to cause a denial of service when an import policy with `then source-based-forwarding next-hop next-table <X>` is configured to reference a routing table that does not exist.
Weakness: CWE-476
Which versions are affected by CVE-2026-101939?
How do I fix CVE-2026-101939?
No fix has been published for CVE-2026-101939 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-101939 being exploited?
There is no known exploitation of CVE-2026-101939 in the wild and no public exploit code.
Sources
Also known as GHSA-jw62-w37q-cc69.