HSEC-2023-0001 (CVE-2022-3433)

Vulnerability from osv_haskell – Published: 2025-11-14 14:45 – Updated: 2025-11-14 14:45 – Source website
VLAI
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.

References
To clipboard 

{
  "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"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.