CVE-2026-104895 (GCVE-0-2026-104895)

Vulnerability from cvelistv5 – Published: 2026-10-28 00:01 – Updated: 2026-10-28 00:01 X_Open Source
VLAI
Title
jackson-dataformat-smile: unbounded eager byte[] allocation for raw binary in the async parser allows OutOfMemoryError denial of service
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-789 - Memory Allocation with Excessive Size Value
Assigner
HeroDevs CNA under the mitre root
CNA scorecard B 82/100 over 17 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
FasterXML jackson-dataformat-smile Affected: 2.9.0 , < 2.18.12 (maven)
Unaffected: 2.18.12 (maven)
Affected: 2.19.0 , < 2.21.8 (maven)
Unaffected: 2.21.8 (maven)
Affected: 2.22.0 , < 2.22.4 (maven)
Unaffected: 2.22.4 (maven)
guessed Create a notification for this product.
FasterXML jackson-dataformat-smile Affected: 3.0.0 , < 3.1.8 (maven)
Unaffected: 3.1.8 (maven)
Affected: 3.2.0 , < 3.2.4 (maven)
Unaffected: 3.2.4 (maven)
guessed Create a notification for this product.
Credits
apvxlab (AppViewX security research) Michael-JRead cowtowncoder (Tatu Saloranta)
Show details on NVD website
To clipboard 

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              "value": "\u003cp\u003eThe 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 \u0026lt;\u0026lt; 6) + (i \u0026amp; 0x3F) without the (value \u0026gt;\u0026gt;\u0026gt; 25) != 0 overflow guard present in the blocking SmileParser._readUnsignedVInt, and _startRawBinary then allocates the declared length immediately.\u003c/p\u003e\u003cp\u003eA 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.\u003c/p\u003e\u003cp\u003eThis 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.\u003c/p\u003e"
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}



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