# CVE-2025-1194: Regular Expression Denial of Service (ReDoS) in huggingface/transformers

> CVE-2025-1194: Regular Expression Denial of Service (ReDoS) in huggingface/transformers. CVSS 4.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-1194
Last updated: 2026-06-17T08:38:34Z

- Published: 2025-04-29 11:30 UTC · Updated: 2026-06-17 08:38 UTC · Assigner: @huntr\_ai
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- EPSS: 0.48%, 41th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1333

## Description

A Regular Expression Denial of Service (ReDoS) vulnerability was identified in the huggingface/transformers library, specifically in the file \`tokenization\_gpt\_neox\_japanese.py\` of the GPT-NeoX-Japanese model. The vulnerability occurs in the SubWordJapaneseTokenizer class, where regular expressions process specially crafted inputs. The issue stems from a regex exhibiting exponential complexity under certain conditions, leading to excessive backtracking. This can result in high CPU usage and potential application downtime, effectively creating a Denial of Service (DoS) scenario. The affected version is v4.48.1 (latest).

## 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-2025-1194)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-1194)
- [https://github.com/huggingface/transformers/commit/92c5ca9dd70de3ade2af2eb835c96215cc50e815](https://github.com/huggingface/transformers/commit/92c5ca9dd70de3ade2af2eb835c96215cc50e815)
- [https://huntr.com/bounties/86f58dcd-683f-4adc-a735-849f51e9abb2](https://huntr.com/bounties/86f58dcd-683f-4adc-a735-849f51e9abb2)

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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-2025-1194 · Markdown: https://rewindex.com/cve/CVE-2025-1194.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-1194 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:01:00.513Z