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Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M

CVE-2026-92693FastNetMon: IPv6 Fragment header dereferenced without bounds check in shared packet parser

High 8.2

In plain English

A high-severity out-of-bounds read in fastnetmon from pavel-odintsov. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.3%top 82.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12fastnetmonno fix listedDEBIAN-CVE-2026-92693
Debian:13fastnetmonno fix listedDEBIAN-CVE-2026-92693
Debian:14fastnetmonno fix listedDEBIAN-CVE-2026-92693
Ubuntu:26.10fastnetmonno fix listedUBUNTU-CVE-2026-92693

Affected products (as reported)

VendorProductVersions
pavel-odintsov fastnetmon <= 1.2.9

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References