CVE-2026-91776

{
  "etk_id": "ETK-2026-17",
  "cve_id": "CVE-2026-91776",
  "display_id": "CVE-2026-91776",
  "ghsa_id": "GHSA-wv8q-qhhj-9h54",
  "euvd_id": "EUVD-2026-85002",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unbounded deserializer cache growth in jackson-databind",
  "summary": "jackson-databind can retain an unbounded number of deserializer-cache entries when name-based polymorphism is configured with a fallback implementation. An attacker able to submit distinct unrecognized type identifiers may increase memory use and cause availability loss if the application reuses a long-lived mapper or deserializer across requests.",
  "mitigation": "Upgrade com.fasterxml.jackson.core:jackson-databind to 2.18.11, 2.21.7, or 2.22.3, or tools.jackson.core:jackson-databind to 3.1.7 or 3.2.3, as appropriate for the deployed release line. Until upgraded, avoid fallback-enabled name-based polymorphism for attacker-controlled input and restrict untrusted type identifiers.",
  "vendor": "maven",
  "product": "maven:com.fasterxml.jackson.core:jackson-databind",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.0.0, <= 2.18.10"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "2.18.11"
      ],
      "package_name": "com.fasterxml.jackson.core:jackson-databind",
      "purl": "pkg:maven/com.fasterxml.jackson.core/jackson-databind"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.19.0, <= 2.21.6"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "2.21.7"
      ],
      "package_name": "com.fasterxml.jackson.core:jackson-databind",
      "purl": "pkg:maven/com.fasterxml.jackson.core/jackson-databind"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.22.0, <= 2.22.2"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "2.22.3"
      ],
      "package_name": "com.fasterxml.jackson.core:jackson-databind",
      "purl": "pkg:maven/com.fasterxml.jackson.core/jackson-databind"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0.0, <= 3.1.6"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "3.1.7"
      ],
      "package_name": "tools.jackson.core:jackson-databind",
      "purl": "pkg:maven/tools.jackson.core/jackson-databind"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.2.0, <= 3.2.2"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "3.2.3"
      ],
      "package_name": "tools.jackson.core:jackson-databind",
      "purl": "pkg:maven/tools.jackson.core/jackson-databind"
    }
  ],
  "cwes": [
    400
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": 0.0045,
  "epss_percentile": 0.3783,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 15.53408785,
  "t0_at": "2026-09-23T02:17:50.480000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-09-23T02:17:50.480000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-23T02:17:50.480000+00:00",
      "url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-wv8q-qhhj-9h54"
    }
  }
}