{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.32.3"
              },
              {
                "fixed": "1.34.7"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "5899dea2b1f8e78f311aaed7db98b82b5537c9f9"
            },
            {
              "fixed": "1fa3b86a0b8d18fe7b60f3228a01d770feb026bc"
            },
            {
              "fixed": "d823199b688052dcdc1646f2ab4cb8c16b1c644a"
            },
            {
              "fixed": "d63b7de3a3568d14ab1351374b205365aed51cca"
            }
          ],
          "repo": "https://github.com/c-ares/c-ares",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6wfj-rwm7-3542"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-415",
      "CWE-416"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33630.json"
  },
  "details": "c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup structures — is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 1.34.7.",
  "id": "CVE-2026-33630",
  "modified": "2026-09-05T03:31:00.924238216Z",
  "published": "2026-09-03T18:42:28.783Z",
  "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/2026/33xxx/CVE-2026-33630.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/c-ares/c-ares/security/advisories/GHSA-6wfj-rwm7-3542"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33630"
    },
    {
      "type": "FIX",
      "url": "https://github.com/c-ares/c-ares/commit/1fa3b86a0b8d18fe7b60f3228a01d770feb026bc"
    },
    {
      "type": "FIX",
      "url": "https://github.com/c-ares/c-ares/commit/d823199b688052dcdc1646f2ab4cb8c16b1c644a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/c-ares/c-ares/pull/1237"
    }
  ],
  "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 : Use-after-free / double-free in c-ares query-completion handling, remotely triggerable via ares_getaddrinfo() over TCP"
}