{
  "cveId": "CVE-2021-21349",
  "url": "https://patchblox.com/security/cve/CVE-2021-21349",
  "summary": "CVE-2021-21349 is fixed in libxstream-java on 1 platform, first by libxstream-java 1.4.11.1-1~18.04.2, released March 22, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libxstream-java: XStream is a Java library to serialize objects to XML and back again",
  "description": "XStream is a Java library to serialize objects to XML and back again. InXStream before version 1.4.16, there is a vulnerability which may allow aremote attacker to request data from internal resources that are notpublicly available only by manipulating the processed input stream. No useris affected, who followed the recommendation to setup XStream\u0027s securityframework with a whitelist limited to the minimal required types. If yourely on XStream\u0027s default blacklist of the Security Framework, you willhave to use at least version 1.4.16.",
  "published": "2021-03-22T17:15:00Z",
  "severity": "Medium",
  "epss": 0.46826,
  "epssPercentile": 0.98834,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libxstream-java",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.4.11.1-1~18.04.2",
      "fix": "libxstream-java 1.4.11.1-1~18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libxstream-java-1.4.11.1-1-18.04.2",
      "released": "2021-03-22T17:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libxstream-java",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.4.11.1-1ubuntu0.2",
      "fix": "libxstream-java 1.4.11.1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libxstream-java-1.4.11.1-1ubuntu0.2",
      "released": "2021-03-22T17:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libxstream-java",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "1.4.15-2",
      "fix": "libxstream-java 1.4.15-2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-libxstream-java-1.4.15-2",
      "released": "2026-01-16T01:42:22Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}