CVE-2026-104895
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
The asynchronous Smile parser (NonBlockingByteArrayParser) uses a raw-binary length prefix 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 the value without the overflow guard present in the blocking parser, and _startRawBinary immediately allocates the declared length. A roughly ten-byte input can force an allocation of about 2 GB, causing OutOfMemoryError or NegativeArraySizeException.
Risk Assessment
An attacker can remotely submit a short payload that exhausts memory or triggers an uncaught exception, crashing the processing thread or the endpoint. No privileges or user interaction beyond the ability to submit data for parsing are required.
Recommendation
Update the Jackson library to a version containing the fix that adds the overflow guard and length limit to the asynchronous Smile parser. Until patched, consider limiting exposure of endpoints that accept Smile data.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS