---
id: CVE-2025-3263
aliases:
  - GHSA-q2wp-rjmx-x6x9
  - PYSEC-2026-1987
title: >-
  Transformers's ReDoS vulnerability in get_configuration_file can lead to
  catastrophic backtracking
summary: >-
  Transformers's ReDoS vulnerability in get_configuration_file can lead to
  catastrophic backtracking
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
vendor: transformers
product: transformers
ecosystem: pip
affected:
  - transformers < 4.51.0
patched:
  - transformers 4.51.0
published: '2025-07-07'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-q2wp-rjmx-x6x9'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-3263'
  - url: >-
      https://github.com/huggingface/transformers/commit/0720e206c6ba28887e4d60ef60a6a089f6c1cc76
  - url: >-
      https://github.com/huggingface/transformers/commit/126abe3461762e5fc180e7e614391d1b4ab051ca
  - url: 'https://github.com/huggingface/transformers'
  - url: 'https://huntr.com/bounties/c7a69150-54f8-4e81-8094-791e7a2a0f29'
tags:
  - osv
  - pip
epss: 0.00435
epssPercentile: 0.37132
ingestedAt: '2026-07-08T18:25:52.066Z'
---

## Overview

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically in the `get_configuration_file()` function within the `transformers.configuration_utils` module. The affected version is 4.49.0, and the issue is resolved in version 4.51.0. The vulnerability arises from the use of a regular expression pattern `config\.(.*)\.json` that can be exploited to cause excessive CPU consumption through crafted input strings, leading to catastrophic backtracking. This can result in model serving disruption, resource exhaustion, and increased latency in applications using the library.

## Affected packages

- `transformers < 4.51.0`

## Remediation

Upgrade to a patched release:

- `transformers 4.51.0`