CVE-2026-101957 Junos OS and Junos OS Evolved: A remote BGP peer causes an rpd crash when long-lived graceful restart (LLGR) is used
A remote BGP peer can crash the routing daemon by sending specific route updates, requiring a non-default LLGR configuration.
- 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-2026-101957?
CVE-2026-101957 is a high-severity denial of service 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
An Improper Initialization vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote BGP peer to cause an rpd crash via an LLGR-stale route update readvertised to a configured non-LLGR peer group.
Weakness: CWE-665
Which versions are affected by CVE-2026-101957?
How do I fix CVE-2026-101957?
No fix has been published for CVE-2026-101957 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-2026-101957 being exploited?
There is no known exploitation of CVE-2026-101957 in the wild and no public exploit code.
Sources
Also known as GHSA-wh22-h2gr-fvpm.