{
  "cveId": "CVE-2025-69873",
  "url": "https://patchblox.com/security/cve/CVE-2025-69873",
  "summary": "CVE-2025-69873 is fixed in node-ajv on 1 platform by DEBIAN-CVE-2025-69873 (version 8.18.0~ds\u002B~cs6.1.1-1), released February 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax ($data reference), which is passed directly to the JavaScript RegExp() constructor without validation. An attacker can inject a malicious regex pattern (e.g., \u0022^(a|a)*$\u0022) combined with crafted input to cause catastrophic backtracking. A 31-character payload causes approximately 44 seconds of CPU blocking, with each additional character doubling execution time. This enables complete denial of service with a single HTTP request against any API using ajv with $data: true for dynamic schema validation.",
  "description": "ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax ($data reference), which is passed directly to the JavaScript RegExp() constructor without validation. An attacker can inject a malicious regex pattern (e.g., \u0022^(a|a)*$\u0022) combined with crafted input to cause catastrophic backtracking. A 31-character payload causes approximately 44 seconds of CPU blocking, with each additional character doubling execution time. This enables complete denial of service with a single HTTP request against any API using ajv with $data: true for dynamic schema validation. This issue is also fixed in version 6.14.0.",
  "published": "2026-02-11T19:15:50Z",
  "severity": "Low",
  "cvss": 2.9,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "cwe": "Inefficient Regular Expression Complexity",
  "epss": 0.00539,
  "epssPercentile": 0.45596,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-69873",
  "fixes": [
    {
      "platform": "linux",
      "product": "node-ajv",
      "release": "Debian 14",
      "fixedVersion": "8.18.0~ds\u002B~cs6.1.1-1",
      "fix": "DEBIAN-CVE-2025-69873",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-69873",
      "released": "2026-02-11T19:15:50Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}