# CVE-2026-92698: FastNetMon out-of-bounds read in sFlow parser

Source: https://junglewise.ai/threats/cve-2026-92698-fastnetmon-is-a-high-performance-ddos-detector-and-sensor-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-05. Updated: 2026-11-05  
License: CC BY 4.0 with a link back

CVE-2026-92698 · Severity: high · CVSS 8.2 · Published 2026-11-05

FastNetMon is a DDoS detection system that analyzes network traffic to identify attacks. An unauthenticated attacker can send a specially crafted sFlow network monitoring packet that causes the detector to crash or read sensitive adjacent memory, disrupting network monitoring and potentially exposing data.

Technologies: [Pavel-Odintsov Fastnetmon](https://junglewise.ai/threats/technologies/fastnetmon). Vendors: [Pavel-Odintsov](https://junglewise.ai/threats/vendors/pavel-odintsov).

## Quick answers

**Is CVE-2026-92698 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92698 being exploited in the wild.

**How severe is CVE-2026-92698?** High severity, with a CVSS score of 8.2, published 5 November 2026.

**Which products and versions are affected?** Pavel-Odintsov Fastnetmon 1.2.9 and earlier.

**Is there a fix for CVE-2026-92698?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-92698 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-92698?** Check whether you run Pavel-Odintsov Fastnetmon at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an out-of-bounds read in process_sflow_flow_sample() in sflow_collector.cpp. An attacker-controlled header_size field in an sFlow v5 UDP packet is passed directly to parse_raw_packet_to_simple_packet_full() without validating it against the remaining buffer bytes, allowing an inflated header_size to create a false end pointer that bypasses nested bounds checks. This requires an unauthenticated remote attacker to send a malformed sFlow packet, triggering a crash and potential memory disclosure through parsed flow fields.

## Affected products

- Pavel Odintsov FastNetMon 1.2.9 and earlier

## Timeline

- 2026-11-05: disclosed

## References

- [https://github.com/pavel-odintsov/fastnetmon/commit/6871b7383322db14405a8de1399a83da15ef3533](https://github.com/pavel-odintsov/fastnetmon/commit/6871b7383322db14405a8de1399a83da15ef3533)
- [https://github.com/pavel-odintsov/fastnetmon/commit/be81c403b9aa891f8444a6379cd4a4fbbc324a83](https://github.com/pavel-odintsov/fastnetmon/commit/be81c403b9aa891f8444a6379cd4a4fbbc324a83)

## Related threats

- [FastNetMon heap-use-after-free in NetFlow/IPFIX template cache](https://junglewise.ai/threats/cve-2026-93424-fastnetmon-is-a-high-performance-ddos-detector-and-sensor-in)
- [FastNetMon out-of-bounds read in pcap packet parser](https://junglewise.ai/threats/cve-2026-92695-fastnetmon-is-a-high-performance-ddos-detector-and-sensor-in)