CVE-2026-92694 Details
Description
FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, FastNetMon's IPv6 top-talkers screen-draw thread in draw_table_ipv6() in src/fastnetmon_logic.cpp iterates ipv6_host_counters.average_speed_map without holding counter_map_mutex while recalculate_speed() inserts new keys and may rehash the same map. The race requires networks_list to include the targeted IPv6 range. It causes confirmed undefined behavior under load; a process crash is plausible but was not observed, so reliable denial of service has not been established. No fixed release is available as of this review.
A data race vulnerability has been identified in FastNetMon, a high-performance DDoS detection tool, in versions through 1.2.9. The issue arises in the IPv6 top-talkers screen-draw thread, specifically within the 'draw_table_ipv6()' function. Here, the thread iterates over a shared map of IPv6 host counters without proper synchronization, while another thread concurrently modifies the map by adding new entries and potentially triggering rehashing operations. This unsynchronized access can lead to undefined behavior, particularly under heavy load, creating a plausible, though unconfirmed, risk of a process crash. The vulnerability requires the networks list to include the targeted IPv6 range to be exploitable.
Users are advised to update to the latest version of FastNetMon, as the vulnerability has been addressed in the official GitHub repository.
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/1294724ea931dc78fe545360f2193398bba35381 | [email protected] | Source CodeVendor |
| https://github.com/pavel-odintsov/fastnetmon/pull/1087 | [email protected] | Issue TrackingVendor |
| https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-phrw-2q76-5m7h | [email protected] | AdvisoryExploitVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-362 | Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| FastNetMon | <= 1.2.9 (semver) |
CPE
Remediation
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 5, 2026 | New CVE Received | [email protected] |