HDFS native client: Out of bounds write in URI parser of native HDFS client

{
  "id": "a69cb13ff1d1509434a836964bc7e2f0823e0fa9318aca4d7ba2267d5d814a62",
  "url": "https://osv.dev/vulnerability/CVE-2025-27821",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HDFS native client: Out of bounds write in URI parser of native HDFS client",
    "summary": "Out-of-bounds Write vulnerability in Apache Hadoop HDFS native client. This issue affects Apache Hadoop: from 3.2.0 before 3.4.2. Users are recommended to upgrade to version 3.4.2, which fixes the issue.",
    "evidence": "osv:CVE-2025-27821",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-27821",
      "aliases": [
        "CVE-2025-27821",
        "GHSA-92cc-952p-v8rh"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/hadoop",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e97acb3bd8f3befd27418996fa5d4b50bf2e17bf"
                },
                {
                  "fixed": "84e8b89ee2ebe6923691205b9e171badde7a495c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:hadoop:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.2.0"
                      },
                      {
                        "fixed": "3.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-27821.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.746788246Z",
      "provider": "osv",
      "references": [
        "https://repo.maven.apache.org/maven2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27821.json",
        "https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-27821"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.2.0"
                  },
                  {
                    "fixed": "3.4.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27821.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-27821",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491548,
  "published_at": "2026-01-26T09:44:13.532+00:00"
}