CVE-2025-3262: Huggingface Transformers

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Huggingface Transformers: before 4.51.0 (fixed in 4.51.0)

Published 2025-07-07. Last modified 2026-06-17.