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5.9 Medium

FastNetMon is a high-performance DDoS detector and sensor.

CVE-2026-92694

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, FastNetMon's IPv6 top-talkers screen-draw thread in drawtableipv6() in src/fastnetmonlogic.cpp iterates ipv6hostcounters.averagespeedmap without holding countermapmutex while recalculatespeed() inserts new keys and may rehash the same map. The race requires networkslist to include the targeted IPv6 range. It causes confirmed undefined behavior under load; a process crash is plausible but was not observed, so reliable denial of service has not been established. No fixed release is available as of this review.

Assessment

CVSS
5.9 (v3.1)
Severity
Medium
Known exploited
Not listed in CISA KEV
Exploit availability
Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published
5 November 2026
Last updated
5 November 2026
Assigner
GitHub_M

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

At the source

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