CVE-2026-93424 Details
Description
FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, peer_find_template() in src/netflow_plugin/netflow_collector.cpp and src/netflow_plugin/netflow_v9_collector.cpp returns a pointer into global_netflow9_templates after releasing the cache mutex. On deployments with at least two entries in netflow_ports, concurrent template redefinition and data-flowset processing can let add_update_peer_template() reassign the template and free its records vector while another listener dereferences the escaped pointer. An unauthenticated sender that can reach both NetFlow/IPFIX listener ports can trigger a heap-use-after-free and reliably crash FastNetMon. No fixed release is available as of this review.
A heap-use-after-free vulnerability has been identified in FastNetMon versions through 1.2.9. The issue arises in the NetFlow/IPFIX template cache, where the function 'peer_find_template()'' returns a pointer to a cached template without proper synchronization. This flaw can be exploited in deployments with multiple NetFlow/IPFIX listener ports, allowing an unauthenticated remote attacker to crash the FastNetMon process by sending specially crafted UDP packets. The vulnerability is caused by concurrent template redefinitions and data processing that interfere with each other, leading to a use-after-free condition.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 5, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/pavel-odintsov/fastnetmon/commit/a24e528d145b5371a7ab0bcdde23e4b4b99506e9 | [email protected] | Source CodeVendor |
| https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-ph88-95vc-x6gv | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| FastNetMon | <= 1.2.9 (semver) |
CPE
Remediation
| |
Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 5, 2026 | New CVE Received | [email protected] |