{"id":"CVE-2026-8686","summary":"DoS from MQTT v5.0 Deserialization Fault in core MQTT","details":"Missing bounds validation in the MQTT v5.0 property parser in coreMQTT before 5.0.1 allows an MQTT broker to cause a denial of service by sending a crafted packet.\n\n\n\nTo remediate this issue, users should upgrade to v5.0.1.","aliases":["GHSA-6qh9-r6jp-2wxc"],"modified":"2026-08-04T11:51:21.987778885Z","published":"2026-05-15T18:38:10.651Z","database_specific":{"cna_assigner":"AMZN","cwe_ids":["CWE-125"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8686.json"},"references":[{"type":"ADVISORY","url":"https://aws.amazon.com/security/security-bulletins/2026-032-aws/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8686.json"},{"type":"ADVISORY","url":"https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8686"},{"type":"FIX","url":"https://github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freertos/coremqtt","events":[{"introduced":"0dd6943057f3fa9a425ea3e1d5e6bd23f5840fd9"},{"last_affected":"0dd6943057f3fa9a425ea3e1d5e6bd23f5840fd9"}],"database_specific":{"extracted_events":[{"introduced":"5.0.0"},{"last_affected":"5.0.0"}],"source":"AFFECTED_FIELD"}}],"versions":["5.0.0","v5.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8686.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}