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CVE-2026-18401 jackson-core: Number length constraint bypass in non-blocking (async) JSON parser leads to potential denial of service

🗓️ 04 Aug 2026 14:23:27Reported by HeroDevsType 
cvelist
 cvelist
🔗 www.cve.org👁 20 Views

Async Jackson parsing bypasses maxNumberLength, enabling long numbers and possible denial of service.

Related
Affected
Refs
[
  {
    "vendor": "FasterXML",
    "product": "jackson-core",
    "collectionURL": "https://repo.maven.apache.org/maven2",
    "packageName": "com.fasterxml.jackson.core:jackson-core",
    "repo": "https://github.com/FasterXML/jackson-core",
    "programFiles": [
      "src/main/java/com/fasterxml/jackson/core/json/async/NonBlockingUtf8JsonParserBase.java"
    ],
    "programRoutines": [
      {
        "name": "NonBlockingUtf8JsonParserBase._finishNumberIntegralPart"
      },
      {
        "name": "NonBlockingUtf8JsonParserBase._valueComplete"
      }
    ],
    "versions": [
      {
        "status": "affected",
        "version": "2.15.0",
        "lessThanOrEqual": "2.18.5",
        "versionType": "maven"
      },
      {
        "status": "unaffected",
        "version": "2.18.6",
        "versionType": "maven"
      },
      {
        "status": "affected",
        "version": "2.19.0",
        "lessThan": "2.21.1",
        "versionType": "maven"
      },
      {
        "status": "unaffected",
        "version": "2.21.1",
        "versionType": "maven"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "FasterXML",
    "product": "jackson-core",
    "collectionURL": "https://repo.maven.apache.org/maven2",
    "packageName": "tools.jackson.core:jackson-core",
    "repo": "https://github.com/FasterXML/jackson-core",
    "programFiles": [
      "src/main/java/tools/jackson/core/json/async/NonBlockingUtf8JsonParserBase.java"
    ],
    "programRoutines": [
      {
        "name": "NonBlockingUtf8JsonParserBase._finishNumberIntegralPart"
      },
      {
        "name": "NonBlockingUtf8JsonParserBase._valueComplete"
      }
    ],
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0",
        "lessThan": "3.1.0",
        "versionType": "maven"
      },
      {
        "status": "unaffected",
        "version": "3.1.0",
        "versionType": "maven"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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