CVE-2025-1194: Huggingface Transformers

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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 products

• Huggingface Transformers: before 4.50.0 (fixed in 4.50.0)

Published 2025-04-29. Last modified 2026-06-17.