id: PYSEC-2025-40
modified: 2025-05-21T19:22:10.801823Z
published: 2025-05-19T12:15:19Z
aliases:
- CVE-2025-2099
- GHSA-qq3j-4f4f-9583
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.
affected:
- package:
    ecosystem: PyPI
    name: transformers
    purl: pkg:pypi/transformers
  ranges:
  - type: GIT
    events:
    - introduced: "0"
    - fixed: 8cb522b4190bd556ce51be04942720650b1a3e57
    repo: https://github.com/huggingface/transformers
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 4.49.0
  versions:
  - "0.1"
  - 2.0.0
  - 2.1.0
  - 2.1.1
  - 2.10.0
  - 2.11.0
  - 2.2.0
  - 2.2.1
  - 2.2.2
  - 2.3.0
  - 2.4.0
  - 2.4.1
  - 2.5.0
  - 2.5.1
  - 2.6.0
  - 2.7.0
  - 2.8.0
  - 2.9.0
  - 2.9.1
  - 3.0.0
  - 3.0.1
  - 3.0.2
  - 3.1.0
  - 3.2.0
  - 3.3.0
  - 3.3.1
  - 3.4.0
  - 3.5.0
  - 3.5.1
  - 4.0.0
  - 4.0.0rc1
  - 4.0.1
  - 4.1.0
  - 4.1.1
  - 4.10.0
  - 4.10.1
  - 4.10.2
  - 4.10.3
  - 4.11.0
  - 4.11.1
  - 4.11.2
  - 4.11.3
  - 4.12.0
  - 4.12.1
  - 4.12.2
  - 4.12.3
  - 4.12.4
  - 4.12.5
  - 4.13.0
  - 4.14.0
  - 4.14.1
  - 4.15.0
  - 4.16.0
  - 4.16.1
  - 4.16.2
  - 4.17.0
  - 4.18.0
  - 4.19.0
  - 4.19.1
  - 4.19.2
  - 4.19.3
  - 4.19.4
  - 4.2.0
  - 4.2.1
  - 4.2.2
  - 4.20.0
  - 4.20.1
  - 4.21.0
  - 4.21.1
  - 4.21.2
  - 4.21.3
  - 4.22.0
  - 4.22.1
  - 4.22.2
  - 4.23.0
  - 4.23.1
  - 4.24.0
  - 4.25.0
  - 4.25.1
  - 4.26.0
  - 4.26.1
  - 4.27.0
  - 4.27.1
  - 4.27.2
  - 4.27.3
  - 4.27.4
  - 4.28.0
  - 4.28.1
  - 4.29.0
  - 4.29.1
  - 4.29.2
  - 4.3.0
  - 4.3.0rc1
  - 4.3.1
  - 4.3.2
  - 4.3.3
  - 4.30.0
  - 4.30.1
  - 4.30.2
  - 4.31.0
  - 4.32.0
  - 4.32.1
  - 4.33.0
  - 4.33.1
  - 4.33.2
  - 4.33.3
  - 4.34.0
  - 4.34.1
  - 4.35.0
  - 4.35.1
  - 4.35.2
  - 4.36.0
  - 4.36.1
  - 4.36.2
  - 4.37.0
  - 4.37.1
  - 4.37.2
  - 4.38.0
  - 4.38.1
  - 4.38.2
  - 4.39.0
  - 4.39.1
  - 4.39.2
  - 4.39.3
  - 4.4.0
  - 4.4.1
  - 4.4.2
  - 4.40.0
  - 4.40.1
  - 4.40.2
  - 4.41.0
  - 4.41.1
  - 4.41.2
  - 4.42.0
  - 4.42.1
  - 4.42.2
  - 4.42.3
  - 4.42.4
  - 4.43.0
  - 4.43.1
  - 4.43.2
  - 4.43.3
  - 4.43.4
  - 4.44.0
  - 4.44.1
  - 4.44.2
  - 4.45.0
  - 4.45.1
  - 4.45.2
  - 4.46.0
  - 4.46.1
  - 4.46.2
  - 4.46.3
  - 4.47.0
  - 4.47.1
  - 4.48.0
  - 4.48.1
  - 4.48.2
  - 4.48.3
  - 4.5.0
  - 4.5.1
  - 4.6.0
  - 4.6.1
  - 4.7.0
  - 4.8.0
  - 4.8.1
  - 4.8.2
  - 4.9.0
  - 4.9.1
  - 4.9.2
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
references:
- type: EVIDENCE
  url: https://huntr.com/bounties/97b780f3-ffca-424f-ad5d-0e1c57a5bde4
- type: FIX
  url: 
    https://github.com/huggingface/transformers/commit/8cb522b4190bd556ce51be04942720650b1a3e57
- type: WEB
  url: https://huntr.com/bounties/97b780f3-ffca-424f-ad5d-0e1c57a5bde4
- type: ADVISORY
  url: https://github.com/advisories/GHSA-qq3j-4f4f-9583