Ghostwire

CVE-2026-48686: FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the BGP NLRI (Network Layer...

CRITICAL CVSS 9.5

Published: May 26, 2026 | Last Modified: May 26, 2026

Description

FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the BGP NLRI (Network Layer Reachability Information) decoder. The function decode_bgp_subnet_encoding_ipv4_raw() in src/bgp_protocol.cpp reads prefix_bit_length directly from the BGP packet (line 99) without validating it is 32 causes undefined behavior.

Ghostwire Analysis — What This Means Practically

Critical CVSS score indicates maximum severity — remote code execution, authentication bypass, or complete system compromise is likely possible.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

Security Coverage (2 articles)

References

www.tenable.com/cve/CVE-2026-48686
www.cnnvd.org.cn/home/globalSearch?keyword=CVE-2026-48686