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Vulnerability record · CVE-2025-3933 · published 11 July 2025

CVE-2025-3933: 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 within the DonutProcessor class's `token2json()` method. This vulnerability affects versions 4.50.3 and earlier, and is fixed in version 4.52.1. The issue arises from the regex pattern `<s_(.*?)>` which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to service disruption, resource exhaustion, and potential API service vulnerabilities, impacting document processing tasks using the Donut model.

5.3 CVSS 3.1 Medium EPSS 0.43% · top 64.7% CWE-1333 · Inefficient regular expression (ReDoS)
5.3CVSS 3.1 base score
0.43%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 within the DonutProcessor class's `token2json()` method. This vulnerability affects versions 4.50.3 and earlier, and is fixed in version 4.52.1. The issue arises from the regex pattern `<s_(.*?)>` which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to service disruption, resource exhaustion, and potential API service vulnerabilities, impacting document processing tasks using the Donut model.

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

Affected products

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

References

LinkTags
https://github.com/huggingface/transformers/commit/ebbe9b12dd75b69f92100d684c47f923ee262a93 Patch
https://huntr.com/bounties/25282953-5827-4384-bb6f-5790d275721b ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-3933), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.