---
id: CVE-2026-101991
title: >-
  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 UPD…
summary: >-
  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 UPD…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-130
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T21:17:26.100'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101991'
references:
  - url: 'https://supportportal.juniper.net/JSA112187'
    label: sirt@juniper.net
tags:
  - nvd
ingestedAt: '2026-10-14T17:44:53.640Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.