# CVE-2026-92697: FastNetMon NetFlow v9 out-of-bounds read in interface collector

Source: https://junglewise.ai/threats/cve-2026-92697-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-2026-92697 · Severity: high · CVSS 7.5 · Published 2026-11-05

FastNetMon is a DDoS detection and network monitoring tool that processes NetFlow data from network devices. In versions 1.2.9 and earlier, a flaw in the NetFlow v9 collector can be exploited by sending specially crafted network packets to cause the application to read memory beyond its intended bounds, leading to a crash and service disruption.

Technologies: [FastNetMon](https://junglewise.ai/threats/technologies/fastnetmon-fastnetmon). Vendors: [FastNetMon](https://junglewise.ai/threats/vendors/fastnetmon).

## Quick answers

**Is CVE-2026-92697 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92697 being exploited in the wild.

**How severe is CVE-2026-92697?** High severity, with a CVSS score of 7.5, published 5 November 2026.

**Which products and versions are affected?** FastNetMon 1.2.9 and earlier.

**Is there a fix for CVE-2026-92697?** 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-2026-92697 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-92697?** Check whether you run 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 the NetFlow v9 options flowset handler, where strlen() is called on an attacker-controlled interface-description field without proper length bounds. An unauthenticated remote attacker sending crafted UDP packets to the collector can trigger a read past the field and packet buffer, potentially crashing the process. The fix uses strnlen() bounded by the declared field length to prevent reads beyond the field boundary.

## Affected products

- FastNetMon FastNetMon 1.2.9 and earlier

## Timeline

- 2026-11-05: disclosed

## References

- [https://github.com/pavel-odintsov/fastnetmon/commit/9dc766074dc3048ec5007bc3f6a44f2b42d1e1cb](https://github.com/pavel-odintsov/fastnetmon/commit/9dc766074dc3048ec5007bc3f6a44f2b42d1e1cb)
- [https://github.com/pavel-odintsov/fastnetmon/pull/1088](https://github.com/pavel-odintsov/fastnetmon/pull/1088)

## Related threats

- [FastNetMon race condition in IPv6 top-talkers display](https://junglewise.ai/threats/cve-2026-92694-fastnetmon-is-a-high-performance-ddos-detector-and-sensor-in)
- [FastNetMon out-of-bounds read in IPv6 fragment header parser](https://junglewise.ai/threats/cve-2026-92693-fastnetmon-is-a-high-performance-ddos-detector-and-sensor-in)