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8.2 High

FastNetMon is a high-performance DDoS detector and sensor.

CVE-2026-92698

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, processsflowflowsample() in src/sflowplugin/sflowcollector.cpp passes the attacker-controlled sflowrawprotocolheadert.headersize to parserawpackettosimplepacketfull() as its trusted captured length without comparing it with the bytes remaining in the record. An inflated headersize creates a false end pointer beyond the received sFlow v5 UDP buffer, defeating the nested parser's bounds checks and causing an unauthenticated remote out-of-bounds read and process crash, with possible limited exposure of adjacent bytes through parsed flow fields. No fixed release is available as of this review.

Assessment

CVSS
8.2 (v3.1)
Severity
High
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:L/PR:N/UI:N/S:U/C:L/I:N/A:H

At the source

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