CVE-2026-101985: Junos OS Evolved: PTX Series: An IS-IS peer causes an rpd crash when BIER over IS-IS is enabled

Published Oct 14, 2026

Updated

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.

Affected Software

1 affected component

Juniper Networks Junos OS Evolved

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 23.2R2-S7.7-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 23.4R2-S8.11-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 24.2R2-S5.6-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 24.4R2-S5-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 25.2R2-S2-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 25.2X100-D35-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 25.4R1-S3-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 25.4R2-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 25.4X300-D40-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 26.2R1-S2-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 26.2R2-EVO
Upgrade
Upgrade Juniper Junos OS Evolved PTX Series to a version that resolves this vulnerability.
Fixed in 26.4R1-EVO

Event History

Oct 14, 2026

CVE Published

via MITRE·04:13 PM

Data Sourced

via MITRE·04:13 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

Which deployments are exposed?

The issue affects Juniper Networks Junos OS Evolved on PTX Series when BIER over IS-IS is enabled. Exploitation is limited to an attacker that can act as an IS-IS peer on the adjacent network.

Does exploitation require authentication or user interaction?

No. The vulnerable condition can be triggered by an unauthenticated IS-IS peer, and no user interaction is required.