Guian Gumpac created TINKERPOP-3281:
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Summary: GraphBinary deserializer unbounded pre-allocation from
length prefixes
Key: TINKERPOP-3281
URL: https://issues.apache.org/jira/browse/TINKERPOP-3281
Project: TinkerPop
Issue Type: Bug
Components: io
Affects Versions: 4.0.0, 3.7.7, 3.8.2
Reporter: Guian Gumpac
GraphBinary value types size a heap allocation (or bound a read loop) from a
4-byte length/count prefix before the payload is read or checked against the
bytes actually remaining. Because GraphBinary is deserialized pre-authentication
on the default wire path, a tiny malformed frame (~6-21 bytes) can declare a
multi-hundred-megabyte to multi-gigabyte allocation and drive Gremlin Server to
OutOfMemoryError. maxContentLength bounds the frame, not a single declared
length, and the binary decoder catches only SerializationException, so the OOM
escapes. The surface is symmetric: a malicious or on-path server can OOM a
connecting driver the same way. The same shape recurs across String, Collection
(list/set), Map, BigInteger, InetAddress, ByteBuffer, Bytecode, P, Tree, graph
and BulkSet.
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