GHSA-6F2X-V7Q7-M7M5

Vulnerability from github – Published: 2026-10-05 22:55 – Updated: 2026-10-05 22:55
VLAI
Summary
hickory-resolver follows irrelevant CNAME records
Details

When the Hickory DNS resolver follows CNAME records, it sends queries that are not necessary to answer the original recursive query. If there are any CNAME records in the authority section or additional section of the response, queries will be sent for those names. If there are any CNAME records that are not part of a CNAME chain starting from the original recursive query name, queries will be sent for those names. This increases query amplification beyond what is necessary to answer the recursive query.

Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "hickory-resolver"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.25.0"
            },
            {
              "fixed": "0.26.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-05T22:55:18Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "When the Hickory DNS resolver follows CNAME records, it sends queries that are not necessary to answer the original recursive query. If there are any CNAME records in the authority section or additional section of the response, queries will be sent for those names. If there are any CNAME records that are not part of a CNAME chain starting from the original recursive query name, queries will be sent for those names. This increases query amplification beyond what is necessary to answer the recursive query.",
  "id": "GHSA-6f2x-v7q7-m7m5",
  "modified": "2026-10-05T22:55:18Z",
  "published": "2026-10-05T22:55:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-6f2x-v7q7-m7m5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hickory-dns/hickory-dns/pull/3871"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hickory-dns/hickory-dns/commit/4689fc8d3ddd3e3f99ec1b7be4e2e9e78afd2e6b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hickory-dns/hickory-dns/commit/ccd6952378f250c714fc2af0cb1053e1c179f832"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hickory-dns/hickory-dns"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hickory-dns/hickory-dns/releases/tag/v0.26.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "hickory-resolver follows irrelevant CNAME records"
}



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