ghsa-qq3j-4f4f-9583
Vulnerability from github
Published
2025-05-19 12:30
Modified
2025-05-22 17:42
Severity ?
5.3 (Medium) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
Hugging Face Transformers Regular Expression Denial of Service
Details

A vulnerability in the preprocess_string() function of the transformers.testing_utils module in huggingface/transformers version v4.48.3 allows for a Regular Expression Denial of Service (ReDoS) attack. The regular expression used to process code blocks in docstrings contains nested quantifiers, leading to exponential backtracking when processing input with a large number of newline characters. An attacker can exploit this by providing a specially crafted payload, causing high CPU usage and potential application downtime, effectively resulting in a Denial of Service (DoS) scenario.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "transformers"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.50.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-2099"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-05-19T21:53:36Z",
    "nvd_published_at": "2025-05-19T12:15:19Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability in the `preprocess_string()` function of the `transformers.testing_utils` module in huggingface/transformers version v4.48.3 allows for a Regular Expression Denial of Service (ReDoS) attack. The regular expression used to process code blocks in docstrings contains nested quantifiers, leading to exponential backtracking when processing input with a large number of newline characters. An attacker can exploit this by providing a specially crafted payload, causing high CPU usage and potential application downtime, effectively resulting in a Denial of Service (DoS) scenario.",
  "id": "GHSA-qq3j-4f4f-9583",
  "modified": "2025-05-22T17:42:18Z",
  "published": "2025-05-19T12:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-2099"
    },
    {
      "type": "WEB",
      "url": "https://github.com/huggingface/transformers/pull/36648"
    },
    {
      "type": "WEB",
      "url": "https://github.com/huggingface/transformers/commit/8cb522b4190bd556ce51be04942720650b1a3e57"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/huggingface/transformers"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/transformers/PYSEC-2025-40.yaml"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/97b780f3-ffca-424f-ad5d-0e1c57a5bde4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hugging Face Transformers Regular Expression Denial of Service"
}


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