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Vulnerability record · CVE-2025-6638 · published 12 September 2025

CVE-2025-6638: Huggingface transformers inefficient regular expression (redos) vulnerability

Huggingface · Transformers

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically affecting the MarianTokenizer's `remove_language_code()` method. This vulnerability is present in version 4.52.4 and has been fixed in version 4.53.0. The 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.

7.5 CVSS 3.1 High EPSS 0.53% · top 57.5% CWE-1333 · Inefficient regular expression (ReDoS)
7.5CVSS 3.1 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically affecting the MarianTokenizer's `remove_language_code()` method. This vulnerability is present in version 4.52.4 and has been fixed in version 4.53.0. The 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/huggingface/transformers/commit/47c34fba5c303576560cb29767efb452ff12b8be Patch
https://huntr.com/bounties/6a6c933f-9ce8-4ded-8b3b-2c1444c61f36 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-6638), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.