{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.34.7"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b"
            },
            {
              "fixed": "f1288bbc70e9a1e0a77134c2382157e52d326aea"
            },
            {
              "fixed": "d63b7de3a3568d14ab1351374b205365aed51cca"
            }
          ],
          "repo": "https://github.com/c-ares/c-ares",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-pjmc-gx33-gc76"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69184.json"
  },
  "details": "c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long descending pointer chain and many resource records whose NAME or RDATA fields refer to the chain, causing repeated decompression work that grows quadratically with message size. A single crafted response can stall the single-threaded c-ares event loop and deny DNS resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.",
  "id": "CVE-2026-69184",
  "modified": "2026-09-20T11:30:33.824281560Z",
  "published": "2026-09-18T17:26:52.210Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/c-ares/c-ares/releases/tag/v1.34.7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69184.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-69184"
    },
    {
      "type": "FIX",
      "url": "https://github.com/c-ares/c-ares/commit/5c8341ba6ff3a8e4e4dfd616f8ed0418838b8b7b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/c-ares/c-ares/commit/f1288bbc70e9a1e0a77134c2382157e52d326aea"
    },
    {
      "type": "FIX",
      "url": "https://github.com/c-ares/c-ares/pull/1164"
    },
    {
      "type": "FIX",
      "url": "https://github.com/c-ares/c-ares/pull/1210"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "c-ares: CPU-exhaustion denial of service via unbounded DNS name compression pointer chains"
}