{"record":{"id":"deae33f41cedae2f","repo":"XTLS/Xray-core","slug":"failed-to-read-payload-length","errorCode":null,"errorMessage":"failed to read payload length","messagePattern":"failed to read payload length","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"proxy/trojan/protocol.go","lineNumber":228,"sourceCode":"\t_, err := b.ReadFrom(c)\n\treturn buf.MultiBuffer{b}, err\n}\n\n// PacketReader is UDP Connection Reader Wrapper for trojan protocol\ntype PacketReader struct {\n\tio.Reader\n}\n\n// ReadMultiBuffer implements buf.Reader\nfunc (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {\n\taddr, port, err := addrParser.ReadAddressPort(nil, r)\n\tif err != nil {\n\t\treturn nil, errors.New(\"failed to read address and port\").Base(err)\n\t}\n\n\tvar lengthBuf [2]byte\n\tif _, err := io.ReadFull(r, lengthBuf[:]); err != nil {\n\t\treturn nil, errors.New(\"failed to read payload length\").Base(err)\n\t}\n\n\tremain := int(binary.BigEndian.Uint16(lengthBuf[:]))\n\tif remain > maxLength {\n\t\treturn nil, errors.New(\"oversize payload\")\n\t}\n\n\tvar crlf [2]byte\n\tif _, err := io.ReadFull(r, crlf[:]); err != nil {\n\t\treturn nil, errors.New(\"failed to read crlf\").Base(err)\n\t}\n\n\tdest := net.UDPDestination(addr, port)\n\tvar mb buf.MultiBuffer\n\tfor remain > 0 {\n\t\tlength := buf.Size\n\t\tif remain < length {\n\t\t\tlength = remain","sourceCodeStart":210,"sourceCodeEnd":246,"githubUrl":"https://github.com/XTLS/Xray-core/blob/7d214f8b094f75322fa3990f8aadad1c912f24f5/proxy/trojan/protocol.go#L210-L246","documentation":"Error \"failed to read payload length\" thrown in XTLS/Xray-core.","triggerScenarios":"Thrown at proxy/trojan/protocol.go:228 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"7d214f8b094f75322fa3990f8aadad1c912f24f5","analyzedAt":"2026-08-15T14:26:24.325Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}