# CVE-2026-92697: FastNetMon: NetFlow v9 unbounded strlen() on interface-description field causes remote out-of-bounds read

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- pavel-odintsov / fastnetmon: <= 1.2.9 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-125

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-ff5f-p5jw-8fq2 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/pavel-odintsov/fastnetmon/pull/1088 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/pavel-odintsov/fastnetmon/commit/9dc766074dc3048ec5007bc3f6a44f2b42d1e1cb (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-92697; retrieved 2026-11-05; source updated 2026-11-05

Revision: 979ad944ef0eca1031c8b998581065b529aa67aa8443d7ed6f7bbe0fe4a0017f

Canonical: https://y2.dev/cve/CVE-2026-92697

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