Live › vulnerability › CVE-2026-104895
Go to dashboardThe asynchronous Smile parser (NonBlockingByteArrayParser) trusts a length prefix from input and allocates that many bytes before reading the body, with no upper bound or overflow check. A roughly ten-byte Smile feed can trigger about 2 GB of allocation (OutOfMemoryError) or a negative length (NegativeArraySizeException), crashing the request or processing thread.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-28 00:29 UTC. All times on this page are UTC.
Applications that use the Jackson Smile dataformat and parse Smile data through the asynchronous, non-blocking parser, especially reactive endpoints that accept data from clients. Services that do not accept Smile input, or that use only the blocking SmileParser, are not described as affected by the sources.
No product ranges from the sources yet.
mvn dependency:tree or gradle dependencies and look for jackson-dataformat-smile.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
The asynchronous Smile parser (NonBlockingByteArrayParser) uses a raw-binary length prefix taken from untrusted input to allocate a byte[] before the body is read, with no upper bound and no overflow check. On the raw-binary marker 0xFD, _decodeVInt() computes (value << 6) + (i & 0x3F) without the (value >>> 25) != 0 overflow guard present in the blocking SmileParser._readUnsignedVInt, and _startRawBinary then allocates the declared length immediately.
A Smile feed of roughly ten bytes can therefore force an eager allocation of approximately 2 GB, producing an OutOfMemoryError on reactive or asynchronous Smile endpoints. A VInt crafted to overflow int yields a negative length and a NegativeArraySizeException, a RuntimeException that is not a JacksonException and so escapes the parser contract. Either outcome crashes the request or processing thread.
This is the same class of issue as CVE-2020-28491 in the CBOR parser of this library, which was fixed with a LONGEST_NON_CHUNKED_BINARY guard; the asynchronous Smile parser never received the equivalent guard. No privileges or user interaction beyond the ability to submit data for parsing are required.
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