{"id":"CVE-2026-90484","summary":"Apache bRPC: Null pointer dereference in MySQL reply parser leading to client crash","details":"The MySQL client response parser in Apache bRPC dereferences a null pointer when the server peer sends a zero-payload-length response packet. A response packet whose declared payload length is zero is accepted by the frame-length check (is_full_package), after which the parser reads the response type byte via an unbounded 5-byte fetch that returns nullptr, and type = p[4] dereferences it, crashing the client process.\n\n\n\nRoot Cause: In brpc::policy::MysqlReply::ConsumePartialIOBuf, buf.fetch(header, 5) returns nullptr when the buffered data only holds the 4-byte header of a zero-length packet, then the code reads p[4] (and, in the fast-auth path, p2[4]) without checking for a null or zero-length packet.\n\n\n\nAffected Scenarios: A brpc MySQL client connecting to a malicious or compromised MySQL server (or a MITM) can be crashed by a zero-length server response packet, resulting in denial of service of the client.\n\n\n\nFix: The fix rejects zero-length response packets (returning PARSE_ERROR_ABSOLUTELY_WRONG) both for the initial response type determination and after a fast-auth marker, before reading the type byte. Upgrade to the Apache bRPC version 1.18.0 or apply the PR patch at https://github.com/apache/brpc/pull/3536.","modified":"2026-10-22T02:48:55.277654559Z","published":"2026-10-21T12:19:37.796Z","database_specific":{"cna_assigner":"apache","cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90484.json"},"references":[{"type":"WEB","url":"https://github.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90484.json"},{"type":"FIX","url":"https://github.com/apache/brpc/pull/3536"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90484"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/brpc","events":[{"introduced":"04d15c08506c4614e2c373662c53ba4ca7055945"},{"fixed":"94f1bbd32845a45f0218dfe43e25791252bdcb72"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"\u003c= 1.11.0"},{"fixed":"1.18.0"}],"source":"AFFECTED_FIELD"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90484.json"}}],"schema_version":"1.9.0"}