{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.2.0"
              },
              {
                "fixed": "1.10.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "26e7619e83e0612ff4922d940627d51ab7c07e45"
            },
            {
              "fixed": "c0c265cacc7f8ed5025b0bfa22f6f5e00145e919"
            }
          ],
          "repo": "https://github.com/absinthe-graphql/absinthe",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9mhv-8h52-q7q2"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43967.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "0b46e3bcc06c0d3797bacd64761b908a84646c1d"
          },
          {
            "fixed": "223600c520493dcaf95080af552c413099f92c9d"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Inefficient Algorithmic Complexity vulnerability in absinthe-graphql absinthe allows unauthenticated denial of service via quadratic fragment-name uniqueness validation.\n\n'Elixir.Absinthe.Phase.Document.Validation.UniqueFragmentNames':run/2 iterates over all fragments and for each one calls duplicate?/2, which evaluates Enum.count(fragments, \u0026(\u00261.name == name)) — a full linear scan of the fragment list. The result is O(N²) comparisons per document, where N is the number of fragment definitions supplied by the caller.\n\nBecause input.fragments is built directly from the GraphQL query body, N is fully attacker-controlled. A minimum-size fragment definition is roughly 16 bytes, so a ~1 MB document carries ~60,000 fragments and forces ~3.6 × 10⁹ comparisons inside this single validation phase. No authentication, schema knowledge, or special configuration is required.\n\nThis issue affects absinthe: from 1.2.0 before 1.10.2.",
  "id": "CVE-2026-43967",
  "modified": "2026-07-08T05:37:36.662689029Z",
  "published": "2026-05-08T15:42:34.347Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-43967.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-43967"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43967.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/absinthe-graphql/absinthe/security/advisories/GHSA-9mhv-8h52-q7q2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43967"
    },
    {
      "type": "FIX",
      "url": "https://github.com/absinthe-graphql/absinthe/commit/223600c520493dcaf95080af552c413099f92c9d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/absinthe-graphql/absinthe"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Quadratic fragment-name uniqueness check causes denial of service in absinthe"
}