{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-104895", "assignerOrgId": "36c7be3b-2937-45df-85ea-ca7133ea542c", "state": "PUBLISHED", "assignerShortName": "HeroDevs", "dateReserved": "2026-10-02T15:02:48.774Z", "datePublished": "2026-10-28T00:01:44.496Z", "dateUpdated": "2026-10-28T00:01:44.496Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "36c7be3b-2937-45df-85ea-ca7133ea542c", "shortName": "HeroDevs", "dateUpdated": "2026-10-28T00:01:44.496Z" }, "title": "jackson-dataformat-smile: unbounded eager byte[] allocation for raw binary in the async parser allows OutOfMemoryError denial of service", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-789", "description": "CWE-789 Memory Allocation with Excessive Size Value", "type": "CWE" } ] } ], "impacts": [ { "capecId": "CAPEC-130", "descriptions": [ { "lang": "en", "value": "CAPEC-130 Excessive Allocation" } ] } ], "affected": [ { "vendor": "FasterXML", "product": "jackson-dataformat-smile", "collectionURL": "https://repo.maven.apache.org/maven2", "packageName": "com.fasterxml.jackson.dataformat:jackson-dataformat-smile", "repo": "https://github.com/FasterXML/jackson-dataformats-binary", "versions": [ { "status": "affected", "version": "2.9.0", "lessThan": "2.18.12", "versionType": "maven" }, { "status": "unaffected", "version": "2.18.12", "versionType": "maven" }, { "status": "affected", "version": "2.19.0", "lessThan": "2.21.8", "versionType": "maven" }, { "status": "unaffected", "version": "2.21.8", "versionType": "maven" }, { "status": "affected", "version": "2.22.0", "lessThan": "2.22.4", "versionType": "maven" }, { "status": "unaffected", "version": "2.22.4", "versionType": "maven" } ], "defaultStatus": "unaffected" }, { "vendor": "FasterXML", "product": "jackson-dataformat-smile", "collectionURL": "https://repo.maven.apache.org/maven2", "packageName": "tools.jackson.dataformat:jackson-dataformat-smile", "repo": "https://github.com/FasterXML/jackson-dataformats-binary", "versions": [ { "status": "affected", "version": "3.0.0", "lessThan": "3.1.8", "versionType": "maven" }, { "status": "unaffected", "version": "3.1.8", "versionType": "maven" }, { "status": "affected", "version": "3.2.0", "lessThan": "3.2.4", "versionType": "maven" }, { "status": "unaffected", "version": "3.2.4", "versionType": "maven" } ], "defaultStatus": "unaffected" } ], "descriptions": [ { "lang": "en", "value": "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.\n\n\n\nA 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.\n\n\n\nThis 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.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

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.

" } ] } ], "tags": [ "x_open-source" ], "references": [ { "url": "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-h3c2-2m49-r49w", "name": "GHSA-h3c2-2m49-r49w", "tags": [ "vendor-advisory" ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } } ], "timeline": [ { "time": "2026-10-20T22:47:00.000Z", "lang": "en", "value": "GHSA-h3c2-2m49-r49w published by the maintainer in FasterXML/jackson-dataformats-binary" } ], "credits": [ { "lang": "en", "value": "apvxlab (AppViewX security research)", "type": "reporter" }, { "lang": "en", "value": "Michael-JRead", "type": "reporter" }, { "lang": "en", "value": "cowtowncoder (Tatu Saloranta)", "type": "coordinator" } ], "source": { "advisory": "GHSA-h3c2-2m49-r49w", "discovery": "EXTERNAL" }, "x_generator": { "engine": "Vulnogram 0.5.0" } } } }