{"id":"CVE-2026-21888","state":"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.","publishedAt":"2026-03-11T15:22:32.463Z","updatedAt":"2026-03-11T15:35:36.678Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["nanomq nanomq"],"affected":[{"vendor":"nanomq","product":"nanomq","versions":[{"version":"<= 0.24.6","status":"affected"}]}],"references":["https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5","https://github.com/nanomq/nanomq/issues/2192"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/21xxx/CVE-2026-21888.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21888","state":"PUBLISHED","datePublished":"2026-03-11T15:22:32.463Z","dateUpdated":"2026-03-11T15:35:36.678Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-05T17:24:36.929Z"},"containers":{"cna":{"title":"MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"nanomq","product":"nanomq","versions":[{"version":"<= 0.24.6","status":"affected"}]}],"references":[{"url":"https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5","name":"https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nanomq/nanomq/issues/2192","name":"https://github.com/nanomq/nanomq/issues/2192","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-11T15:22:32.463Z"},"source":{"advisory":"GHSA-cggc-6m7w-j7x5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-11T15:35:24.683645Z","id":"CVE-2026-21888","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-11T15:35:36.678Z"}}]}}}