jackson-dataformat-smile: unbounded eager byte[] allocation for raw binary in the async parser allows OutOfMemoryError denial of service

{
  "id": "f8659e3e17a25c7377ec090da43ee87df2922bb041f69879e859fd11907323b0",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-104895",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "cve:CVE-2026-104895",
    "products": [
      {
        "name": {
          "value": "jackson-dataformat-smile",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "jackson-dataformat-smile",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-104895",
      "aliases": [
        "CVE-2026-104895"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 7.5,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "affected": [
        {
          "repo": "https://github.com/FasterXML/jackson-dataformats-binary",
          "vendor": "FasterXML",
          "product": "jackson-dataformat-smile",
          "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"
            }
          ],
          "packageName": "com.fasterxml.jackson.dataformat:jackson-dataformat-smile",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://github.com/FasterXML/jackson-dataformats-binary",
          "vendor": "FasterXML",
          "product": "jackson-dataformat-smile",
          "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"
            }
          ],
          "packageName": "tools.jackson.dataformat:jackson-dataformat-smile",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-28T00:01:44.496Z",
      "provider": "cve",
      "references": [
        "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-h3c2-2m49-r49w"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "36c7be3b-2937-45df-85ea-ca7133ea542c",
          "shortName": "HeroDevs",
          "dateUpdated": "2026-10-28T00:01:44.496Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104895",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 400749,
  "published_at": "2026-10-28T00:01:44.496+00:00"
}