hsec-2023-0001
Vulnerability from osv_haskell
Published
2025-11-14 14:45
Modified
2025-11-14 14:45
Summary
Hash flooding vulnerability in aeson
Details

Hash flooding vulnerability in aeson

aeson was vulnerable to hash flooding (a.k.a. hash DoS). The issue is a consequence of the HashMap implementation from unordered-containers. It results in a denial of service through CPU consumption. This technique has been used in real-world attacks against a variety of languages, libraries and frameworks over the years.

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{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2023/HSEC-2023-0001.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2023/HSEC-2023-0001.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "aeson"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4.0.0"
            },
            {
              "fixed": "2.0.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-3433"
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# Hash flooding vulnerability in aeson\n\n*aeson* was vulnerable to hash flooding (a.k.a. hash DoS).  The\nissue is a consequence of the HashMap implementation from\n*unordered-containers*.  It results in a denial of service through\nCPU consumption.  This technique has been used in real-world attacks\nagainst a variety of languages, libraries and frameworks over the\nyears.\n",
  "id": "HSEC-2023-0001",
  "modified": "2025-11-14T14:45:34Z",
  "published": "2025-11-14T14:45:34Z",
  "references": [
    {
      "type": "ARTICLE",
      "url": "https://cs-syd.eu/posts/2021-09-11-json-vulnerability"
    },
    {
      "type": "ARTICLE",
      "url": "https://frasertweedale.github.io/blog-fp/posts/2021-10-12-aeson-hash-flooding-protection.html"
    },
    {
      "type": "DISCUSSION",
      "url": "https://github.com/haskell/aeson/issues/864"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "Hash flooding vulnerability in aeson"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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