pysec-2025-40
Vulnerability from pysec
Published
2025-05-19 12:15
Modified
2025-05-21 19:22
Severity ?
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.
Impacted products
| Name | purl | transformers | pkg:pypi/transformers |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "transformers",
"purl": "pkg:pypi/transformers"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "8cb522b4190bd556ce51be04942720650b1a3e57"
}
],
"repo": "https://github.com/huggingface/transformers",
"type": "GIT"
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.49.0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
}
],
"aliases": [
"CVE-2025-2099"
],
"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": "PYSEC-2025-40",
"modified": "2025-05-21T19:22:10.801823+00:00",
"published": "2025-05-19T12:15:19+00:00",
"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"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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