What is CVE-2026-102027?

CVE-2026-102027 is a high-severity vulnerability in Juniper Networks Junos OS, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2026-10-14.

How severe is CVE-2026-102027?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Juniper Networks Junos OS

CVE-2026-102027

An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a configured eBGP neighbor to cause an rpd crash via BGP labeled-unicast UPDATEs when the affected multipath features are enabled.

Published 2026-10-14.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

References

supportportal.juniper.net/JSA112187 (vendor-advisory)

Frequently asked questions

What is CVE-2026-102027?: CVE-2026-102027 is a high-severity vulnerability in Juniper Networks Junos OS, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2026-10-14.
How severe is CVE-2026-102027?: High severity. CVSS v3 base score is 7.5 out of 10.