CVE catalog
CVE-2025-6638
Hugging Face Transformers is vulnerable to ReDoS…
A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library. he issue arises from inefficient regex processing, which can be exploited by crafted input strings containing malformed language code patterns, leading to excessive CPU consumption and potential denial of service. transformers: Regular Expression Denial of Service (ReDoS) in huggingface/transformers The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
- Severity
- Medium · CVSS 5.3
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.56% · Oct 27, 2026
Reported versions and fixes
Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.
Version impact has not been established. The original provider fields are retained below.
Provider details and historical evidence
Original provider fields
{
"package_releases": [],
"fixed_versions": [],
"distribution_packages": [
{
"name": "transformers",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.53.0"
}
]
}
],
"ecosystem": "PyPI",
"fixed_version": "4.53.0",
"provider_record_id": "PYSEC-2026-1981"
},
{
"name": "transformers",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.53.0"
}
]
}
],
"ecosystem": "PyPI",
"fixed_version": "4.53.0",
"provider_record_id": "GHSA-59P9-H35M-WG4G"
}
]
}OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
Observed: