CVE-2026-102043
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Numeric Truncation Error in Juniper Junos OS MPLS-TE Fast-Reroute

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description
A Numeric Truncation Error vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to crash the routing process via MPLS-TE fast-reroute signaling.

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Meta Information

Published
2026-10-14
Last Modified
2026-10-14
Generated
2026-11-08
AI Q&A
2026-10-15
EPSS Evaluated
2026-11-07
NVD
CVE-2026-102043
EUVD
EUVD-2026-101367

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-197 Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.

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Executive Summary

This vulnerability is a Numeric Truncation Error in Juniper Networks Junos OS and Junos OS Evolved. It occurs in the rpd process and is triggered by MPLS-TE fast-reroute signaling. An adjacent attacker can exploit this to crash the routing process.

Detection Guidance

This vulnerability involves a numeric truncation error in Juniper Junos OS and Junos OS Evolved affecting the rpd process during MPLS-TE fast-reroute signaling. Detection requires monitoring for crashes in the routing process or unusual MPLS-TE signaling behavior. Juniper recommends checking logs for rpd crashes and examining MPLS-TE signaling messages for anomalies. No specific commands are provided in the CVE details.

Impact Analysis

The impact includes disruption of network routing services due to the crash of the routing process. This can lead to network outages or instability, affecting communication and data flow.

Compliance Impact

The vulnerability causes routing process crashes via MPLS-TE fast-reroute signaling, which may lead to network disruptions. This could impact compliance by failing to maintain data integrity and availability required by standards like GDPR and HIPAA.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved patches from Juniper Networks to address the numeric truncation error in the rpd process. Monitor routing process crashes and MPLS-TE fast-reroute signaling anomalies as potential indicators of exploitation.

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