---
id: CVE-2026-92695
title: >-
  FastNetMon: Legacy pcap parse_packet() has no bounds checking, causing
  out-of-bounds read on truncated frames
summary: >-
  FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9
  and earlier, the live parse_packet() callback in
  src/pcap_plugin/pcap_collector.cpp is registered through pcap_loop and
  processes captured frames when pcap = on …
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: pavel-odintsov
product: fastnetmon
affected:
  - fastnetmon <= 1.2.9
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T22:30:59.204Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92695'
references:
  - url: >-
      https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-c27c-943r-vr8h
    label: >-
      https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-c27c-943r-vr8h
  - url: >-
      https://github.com/pavel-odintsov/fastnetmon/commit/5d0ee2d25fddb2db746ce4ce3326a589a2afef40
    label: >-
      https://github.com/pavel-odintsov/fastnetmon/commit/5d0ee2d25fddb2db746ce4ce3326a589a2afef40
tags:
  - cve.org
ingestedAt: '2026-11-05T23:41:31.944Z'
epss: 0.00258
epssPercentile: 0.17574
---

## Overview

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the live parse_packet() callback in src/pcap_plugin/pcap_collector.cpp is registered through pcap_loop and processes captured frames when pcap = on without checking packethdr->caplen. A short frame or an attacker-controlled IPv4 header length can make the parser dereference IP or transport headers beyond the captured bytes, causing an out-of-bounds read and process termination. No fixed release is available as of this review.

## Affected

- `fastnetmon <= 1.2.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.