CVE-2026-92698 (GCVE-0-2026-92698)

Vulnerability from cvelistv5 – Published: 2026-11-05 22:35 – Updated: 2026-11-09 17:40
VLAI
Title
FastNetMon: sFlow header_size field trusted as parser capture length causes remote out-of-bounds read
Summary
FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, process_sflow_flow_sample() in src/sflow_plugin/sflow_collector.cpp passes the attacker-controlled sflow_raw_protocol_header_t.header_size to parse_raw_packet_to_simple_packet_full() as its trusted captured length without comparing it with the bytes remaining in the record. An inflated header_size 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.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 17:38 UTC
CWE
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
pavel-odintsov fastnetmon Affected: <= 1.2.9
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