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junos-os

junos-os-evo

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.

This vulnerability (CVE-2026-101991) arises from improper handling of length parameter inconsistencies in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved. Specifically, a configured BGP-LS peer can trigger heap data disclosure by sending a malformed UPDATE message over a session where the traffic-engineering address family is enabled. The issue is categorized under CWE-130 (Improper Handling of Length Parameter Inconsistency). The CVSS v3.1 base score is 3.1, indicating low severity, with attack vector as adjacent network, high attack complexity, no privileges required, no user interaction, and limited confidentiality impact. Multiple affected version ranges are identified across different Junos OS and Junos OS Evolved releases.

CVE-2026-101991 is a low severity vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It involves improper handling of length parameter inconsistency in the routing protocol daemon (rpd). A configured BGP-LS peer can cause heap data disclosure by sending a malformed UPDATE message over 

CVE-2026-101991: CWE-130 Improper Handling of Length Parameter Inconsistency in Juniper Networks Junos OS

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