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Vulnerability record · CVE-2025-3262 · published 7 July 2025

CVE-2025-3262: Huggingface transformers inefficient regular expression (redos) vulnerability

Huggingface · Transformers

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the huggingface/transformers repository, specifically in version 4.49.0. The vulnerability is due to inefficient regular expression complexity in the `SETTING_RE` variable within the `transformers/commands/chat.py` file. The regex contains repetition groups and non-optimized quantifiers, leading to exponential backtracking when processing 'almost matching' payloads. This can degrade application performance and potentially result in a denial-of-service (DoS) when handling specially crafted input strings. The issue is fixed in version 4.51.0.

7.5 CVSS 3.1 High EPSS 0.46% · top 62.6% CWE-1333 · Inefficient regular expression (ReDoS)
7.5CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the huggingface/transformers repository, specifically in version 4.49.0. The vulnerability is due to inefficient regular expression complexity in the `SETTING_RE` variable within the `transformers/commands/chat.py` file. The regex contains repetition groups and non-optimized quantifiers, leading to exponential backtracking when processing 'almost matching' payloads. This can degrade application performance and potentially result in a denial-of-service (DoS) when handling specially crafted input strings. The issue is fixed in version 4.51.0.

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/0720e206c6ba28887e4d60ef60a6a089f6c1cc76 Patch
https://huntr.com/bounties/ecf5ccc4-39e7-4fb3-b547-14a41d31a184 ExploitThird Party Advisory
https://huntr.com/bounties/ecf5ccc4-39e7-4fb3-b547-14a41d31a184 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-3262), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.