Bug 2567967 (CVE-2026-92697)

Summary: CVE-2026-92697 fastnetmon: fastnetmon: Denial of Service via crafted NetFlow packets
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FastNetMon. This vulnerability allows an unauthenticated remote attacker to cause a Denial of Service (DoS) by crashing the service. By sending specially crafted network packets containing unterminated data fields to the NetFlow collector, an attacker can trigger an out-of-bounds read error that abruptly terminates the monitoring process.
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Description OSIDB Bzimport 2026-11-05 22:42:34 UTC 
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.