{"id":"CVE-2026-21888","aliases":["EUVD-2026-11190","GHSA-cggc-6m7w-j7x5"],"status":"published","title":"MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()","description":"NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00351,"percentile":0.29133,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2026-03-11T15:22:32Z","modified":"2026-10-28T02:30:30Z","products":[{"vendor":"emqx","product":"nanomq"},{"vendor":"nanomq","product":"nanomq"}],"references":[{"url":"https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory"]},{"url":"https://github.com/nanomq/nanomq/issues/2192","tags":["x_refsource_MISC","Issue Tracking","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21888.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21888","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-21888","title":"MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()","description":"NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.","status":"published","published":"2026-03-11T15:22:32.463Z","modified":"2026-03-11T15:35:36.678Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T13:41:53.237769Z"}],"euvd":[{"id":"EUVD-2026-11190","description":"NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.","status":"published","published":"2026-03-11T15:22:32Z","modified":"2026-03-11T15:35:36Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T19:25:37.250097Z"}],"nvd":[{"id":"CVE-2026-21888","description":"NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.","status":"published","published":"2026-03-11T16:16:23.93Z","modified":"2026-06-17T10:19:05.75Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:12:08.98071Z"}],"osv":[{"id":"CVE-2026-21888","title":"MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()","description":"NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.","status":"published","published":"2026-03-11T15:22:32.463Z","modified":"2026-10-28T02:30:30.376071951Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:44:58.42038Z"}]}}