CVE-2026-101991
Received
Received - Intake
Improper Handling of Length Parameter Inconsistency in Juniper Junos OS
Vulnerability report for CVE-2026-101991, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-14
Last updated on: 2026-10-14
Assigner: Juniper Networks, Inc.
Description
Description
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a configured BGP-LS peer to cause heap data disclosure via a malformed UPDATE sent over a session with the traffic-engineering address family enabled.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Juniper | Networks | Junos OS 0 |
| Juniper | Networks | Junos OS 23.4 |
| Juniper | Networks | Junos OS 24.2 |
| Juniper | Networks | Junos OS 24.4 |
| Juniper | Networks | Junos OS 25.2 |
| Juniper | Networks | Junos OS 25.4 |
| Juniper | Networks | Junos OS 26.2 |
| Juniper | Networks | Junos OS Evolved 0 |
| Juniper | Networks | Junos OS Evolved 23.4 |
| Juniper | Networks | Junos OS Evolved 24.2 |
| Juniper | Networks | Junos OS Evolved 24.4 |
| Juniper | Networks | Junos OS Evolved 25.2 |
| Juniper | Networks | Junos OS Evolved 25.4 |
| Juniper | Networks | Junos OS Evolved 26.2 |
| Juniper | Networks | Junos OS Evolved 23.4X100 |
| Juniper | Networks | Junos OS Evolved 25.2X100 |
| Juniper | Networks | Junos OS Evolved 25.4X300 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-130 | The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data. |
