# CVE-2025-6051: Regular Expression Denial of Service (ReDoS) in huggingface/transformers

> CVE-2025-6051: Regular Expression Denial of Service (ReDoS) in huggingface/transformers. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-6051
Last updated: 2026-09-30T23:10:00Z

- Published: 2025-09-14 17:03 UTC · Updated: 2026-09-30 23:10 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: 0.38%, 32th 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 \`normalize\_numbers()\` method of the \`EnglishNormalizer\` class. This vulnerability affects versions up to 4.52.4 and is fixed in version 4.53.0. The issue arises from the method's handling of numeric strings, which can be exploited using crafted input strings containing long sequences of digits, leading to excessive CPU consumption. This vulnerability impacts text-to-speech and number normalization tasks, potentially causing service disruption, resource exhaustion, and API vulnerabilities.

## 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-2025-6051)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-6051)
- [https://github.com/huggingface/transformers/commit/ba8eaba9865618253f997784aa565b96206426f0](https://github.com/huggingface/transformers/commit/ba8eaba9865618253f997784aa565b96206426f0)
- [https://huntr.com/bounties/af929523-7b59-418a-bf55-301830b2ac9d](https://huntr.com/bounties/af929523-7b59-418a-bf55-301830b2ac9d)

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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-2025-6051 · Markdown: https://rewindex.com/cve/CVE-2025-6051.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-6051 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:48.610Z