# CVE-2025-3933: Regular Expression Denial of Service (ReDoS) in huggingface/transformers

> CVE-2025-3933: Regular Expression Denial of Service (ReDoS) in huggingface/transformers. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-3933
Last updated: 2026-06-17T09:20:57Z

- Published: 2025-07-11 09:22 UTC · Updated: 2026-06-17 09:20 UTC · Assigner: @huntr\_ai
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS: 0.50%, 42th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1333

## 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.

## Affected vendors and products

- huggingface: huggingface/transformers

## Tracked companies

- [Hugging Face](https://rewindex.com/company/hugging-face.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-3933)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-3933)
- [https://github.com/huggingface/transformers/commit/ebbe9b12dd75b69f92100d684c47f923ee262a93](https://github.com/huggingface/transformers/commit/ebbe9b12dd75b69f92100d684c47f923ee262a93)
- [https://huntr.com/bounties/25282953-5827-4384-bb6f-5790d275721b](https://huntr.com/bounties/25282953-5827-4384-bb6f-5790d275721b)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-3933 · Markdown: https://rewindex.com/cve/CVE-2025-3933.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-3933 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:41.006Z