{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "2.0.0"
              },
              {
                "fixed": "4.0.1"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "a7ce34b42892ab305b2ef7dbe873bcabf4ef93ca"
            },
            {
              "fixed": "c41c8d48ace8141b003f6f1de3ca6734a0c53056"
            },
            {
              "fixed": "3d25f9fea26c90609de9d64366fedfe5065413bc"
            }
          ],
          "repo": "https://github.com/benoitc/hackney",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jq4m-q6p2-8gwc"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47077.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "0334af206d5099fdf510ed9eda18e34396f065ad"
          },
          {
            "fixed": "3d25f9fea26c90609de9d64366fedfe5065413bc"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition.\n\nThis issue affects hackney: from 2.0.0 before 4.0.1.",
  "id": "CVE-2026-47077",
  "modified": "2026-07-08T05:37:42.198438320Z",
  "published": "2026-05-25T14:00:42.217Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-47077.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47077"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47077.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47077"
    },
    {
      "type": "FIX",
      "url": "https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/benoitc/hackney"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unbounded body accumulation in HTTP/3 response loop in hackney"
}