{"id":"CVE-2026-44639","title":"NanoMQ is an MQTT broker","summary":"NanoMQ is an MQTT broker. Prior to 0.24.14, NanoMQ's MQTT v5 property decoder in nng/src/supplemental/mqtt/mqtt_codec.c uses property_append() to walk the entire linked list for each property added by decode_buf_properties(). A remote un…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-407"],"vendor":"nanomq","product":"nanomq","affected":["nanomq < 0.24.14"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:06.990","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44639","references":[{"url":"https://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07","label":"security-advisories@github.com"},{"url":"https://github.com/nanomq/NanoNNG/pull/1508","label":"security-advisories@github.com"},{"url":"https://github.com/nanomq/nanomq/releases/tag/0.24.14","label":"security-advisories@github.com"},{"url":"https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv","label":"security-advisories@github.com"},{"url":"https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T17:19:13.578066Z"},"ingestedAt":"2026-09-18T16:45:41.411Z","epss":0.00338,"epssPercentile":0.27191,"slug":"CVE-2026-44639","body":"## Overview\n\nNanoMQ is an MQTT broker. Prior to 0.24.14, NanoMQ's MQTT v5 property decoder in nng/src/supplemental/mqtt/mqtt_codec.c uses property_append() to walk the entire linked list for each property added by decode_buf_properties(). A remote unauthenticated client can supply a PUBLISH or SUBSCRIBE packet containing many User Properties, causing O(N²) linked-list insertion and CPU work that makes the broker unresponsive; repeated packets can sustain the denial of service. This issue is fixed in version 0.24.14.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":32,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":207051,"id":"CVE-2026-44639","ts":1789753638334,"field":"exploit_available","old":"false","new":"true"}]}