pavel-odintsov FastNetMon up to 1.2.9 Pcap Parser pcap_collector.cpp parse_packet caplen out-of-bounds

Summaryinfo

A vulnerability has been found in pavel-odintsov FastNetMon up to 1.2.9 and classified as critical. This impacts the function parse_packet of the file src/pcap_plugin/pcap_collector.cpp of the component Pcap Parser. The manipulation of the argument caplen leads to out-of-bounds. This vulnerability is listed as CVE-2026-92695. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in pavel-odintsov FastNetMon up to 1.2.9. It has been rated as critical. This issue affects the function parse_packet of the file src/pcap_plugin/pcap_collector.cpp of the component Pcap Parser. The manipulation of the argument caplen with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-92695 since 09/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/06/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-117833). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• pavel-odintsov

Name

• FastNetMon

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9

Website

• Product: https://github.com/pavel-odintsov/fastnetmon/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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