{"id":"CVE-2026-92694","title":"FastNetMon: IPv6 host counters map iterated without lock, racing concurrent inserts","summary":"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 with…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-362"],"vendor":"pavel-odintsov","product":"fastnetmon","affected":["fastnetmon <= 1.2.9"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T22:29:26.943Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-92694","references":[{"url":"https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-phrw-2q76-5m7h","label":"https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-phrw-2q76-5m7h"},{"url":"https://github.com/pavel-odintsov/fastnetmon/pull/1087","label":"https://github.com/pavel-odintsov/fastnetmon/pull/1087"},{"url":"https://github.com/pavel-odintsov/fastnetmon/commit/1294724ea931dc78fe545360f2193398bba35381","label":"https://github.com/pavel-odintsov/fastnetmon/commit/1294724ea931dc78fe545360f2193398bba35381"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T23:41:31.944Z","epss":0.00247,"epssPercentile":0.16032,"slug":"CVE-2026-92694","body":"## Overview\n\nFastNetMon 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.\n\n## Affected\n\n- `fastnetmon <= 1.2.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}