CVE-2026-92693: high-severity vulnerability in pavel-odintsov fastnetmon
FastNetMon: IPv6 Fragment header dereferenced without bounds check in shared packet parser
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.3%
FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, parse_raw_packet_to_simple_packet_full() in src/simple_packet_parser_ng.cpp dereferences ipv6_extension_header_fragment_t when IpProtocolNumberIPV6_FRAG is present without first verifying that the eight-byte Fragment header remains. A crafted sFlow v5 RAW_PACKET_HEADER record can remotely reach this shared parser with the Fragment bytes omitted, causing an unauthenticated remote out-of-bounds read. The supplied harness detects the read under AddressSanitizer, but the advisory does not establish a production process crash. No fixed release is available as of this review.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Affected products
pavel-odintsov · fastnetmonRelated CVEs — pavel-odintsov fastnetmon
In the same product, most dangerous first.
CVE-2026-92697HIGHFastNetMon: NetFlow v9 unbounded strlen() on interface-description field causes remote out-of-bounds readEPSS 1.1%CVE-2026-92698HIGHFastNetMon: sFlow header_size field trusted as parser capture length causes remote out-of-bounds readEPSS 0.3%CVE-2026-93424HIGHFastNetMon: NetFlow/IPFIX template cache returns unlocked pointers, causing heap-use-after-free on multi-port deploymentsEPSS 0.3%CVE-2026-92695HIGHFastNetMon: Legacy pcap parse_packet() has no bounds checking, causing out-of-bounds read on truncated framesEPSS 0.3%CVE-2026-92694MEDIUMFastNetMon: IPv6 host counters map iterated without lock, racing concurrent insertsEPSS 0.2%