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CVE-2026-68496

Estado: Pendiente de análisisAlta (7.5)—

The Smile parser in FasterXML jackson-dataformats-binary never invokes StreamReadConstraints.validateNameLength() when decoding JSON object property names, so the maxNameLength limit is not enforced for this format. SmileParser._handleLongFieldName() grows its internal name buffer through an unconstrained _growArrayTo() call and performs no length validation. An attacker who can have a Smile document parsed may therefore embed a single property name of unbounded length; the parser buffers the whole name in memory before returning it, whatever maxNameLength is configured to.

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Because StreamReadConstraints.maxDocumentLength is also disabled by default, nothing else bounds the name under default settings, so the only limits are the attacker's upload capacity and available heap, leading to memory exhaustion and denial of service. No privileges beyond the ability to submit data to a parsing endpoint are required, and exploitation needs only that the bytes reach SmileFactory parsing, directly or through an ObjectMapper configured with the Smile module. jackson-core's own JSON parsers enforce maxNameLength incrementally during name decoding; this gap is specific to the binary formats. maxNameLength and validateNameLength were introduced in jackson-core 2.16.0, so releases before 2.16.0 do not contain the constraint that is left unenforced. This issue is tracked together with the CBOR parser defect in the same vendor advisory, GHSA-3v8f-v6vx-fmrm, which covers both binary formats. The Smile parser defect (jackson-dataformats-binary issue #726) is CVE-2026-68496; the CBOR parser defect (issue #725) is assigned CVE-2026-68495.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad en parser Smile de jackson-dataformats-binary sin validación de longitud de nombres de propiedades, permitiendo DoS por agotamiento de memoria (heap exhaustion) sin autenticación, explotable vía AV:N/AC:L/PR:N.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Fasterxml — Jackson-dataformats-binaryAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-68496",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-68496",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-01T18:15:29.774591Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
        "cvssData": {
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
      "affectedData": [
        {
          "repo": "https://github.com/FasterXML/jackson-dataformats-binary",
          "vendor": "FasterXML",
          "product": "jackson-dataformats-binary",
          "versions": [
            {
              "status": "affected",
              "version": "2.16.0",
              "versionType": "maven",
              "lessThanOrEqual": "2.18.9"
            },
            {
              "status": "affected",
              "version": "2.19.0",
              "versionType": "maven",
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              "version": "2.22.0",
              "versionType": "maven",
              "lessThanOrEqual": "2.22.1"
            }
          ],
          "packageName": "com.fasterxml.jackson.dataformat:jackson-dataformat-smile",
          "collectionURL": "https://repo1.maven.org/maven2",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "com.fasterxml.jackson.dataformat.smile.SmileParser._handleLongFieldName"
            }
          ]
        },
        {
          "repo": "https://github.com/FasterXML/jackson-dataformats-binary",
          "vendor": "FasterXML",
          "product": "jackson-dataformats-binary",
          "versions": [
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              "status": "affected",
              "version": "3.0.0",
              "versionType": "maven",
              "lessThanOrEqual": "3.1.5"
            },
            {
              "status": "affected",
              "version": "3.2.0",
              "versionType": "maven",
              "lessThanOrEqual": "3.2.1"
            }
          ],
          "packageName": "tools.jackson.dataformat:jackson-dataformat-smile",
          "collectionURL": "https://repo1.maven.org/maven2",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "tools.jackson.dataformat.smile.SmileParser._handleLongFieldName"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-10-01T18:17:27.360",
  "references": [
    {
      "url": "https://github.com/FasterXML/jackson-dataformats-binary/blob/2.18/release-notes/VERSION-2.x",
      "source": "36c7be3b-2937-45df-85ea-ca7133ea542c"
    },
    {
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      "source": "36c7be3b-2937-45df-85ea-ca7133ea542c"
    },
    {
      "url": "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-3v8f-v6vx-fmrm",
      "source": "36c7be3b-2937-45df-85ea-ca7133ea542c"
    },
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68495",
      "source": "36c7be3b-2937-45df-85ea-ca7133ea542c"
    },
    {
      "url": "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-3v8f-v6vx-fmrm",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Smile parser in FasterXML jackson-dataformats-binary never invokes StreamReadConstraints.validateNameLength() when decoding JSON object property names, so the maxNameLength limit is not enforced for this format. SmileParser._handleLongFieldName() grows its internal name buffer through an unconstrained _growArrayTo() call and performs no length validation. An attacker who can have a Smile document parsed may therefore embed a single property name of unbounded length; the parser buffers the whole name in memory before returning it, whatever maxNameLength is configured to. Because StreamReadConstraints.maxDocumentLength is also disabled by default, nothing else bounds the name under default settings, so the only limits are the attacker's upload capacity and available heap, leading to memory exhaustion and denial of service. No privileges beyond the ability to submit data to a parsing endpoint are required, and exploitation needs only that the bytes reach SmileFactory parsing, directly or through an ObjectMapper configured with the Smile module. jackson-core's own JSON parsers enforce maxNameLength incrementally during name decoding; this gap is specific to the binary formats. maxNameLength and validateNameLength were introduced in jackson-core 2.16.0, so releases before 2.16.0 do not contain the constraint that is left unenforced. This issue is tracked together with the CBOR parser defect in the same vendor advisory, GHSA-3v8f-v6vx-fmrm, which covers both binary formats. The Smile parser defect (jackson-dataformats-binary issue #726) is CVE-2026-68496; the CBOR parser defect (issue #725) is assigned CVE-2026-68495."
    }
  ],
  "lastModified": "2026-10-02T18:44:11.270",
  "sourceIdentifier": "36c7be3b-2937-45df-85ea-ca7133ea542c"
}