---
id: CVE-2025-3264
aliases:
  - GHSA-jjph-296x-mrcr
  - PYSEC-2026-1985
title: Transformers vulnerable to ReDoS attack through its get_imports() function
summary: Transformers vulnerable to ReDoS attack through its get_imports() function
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-jjph-296x-mrcr'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-3264'
  - 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/3c6f7822-9992-476d-8cf0-b0b1623427df'
tags:
  - osv
  - pip
epss: 0.00435
epssPercentile: 0.37254
ingestedAt: '2026-07-08T18:25:50.827Z'
---

## Overview

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically in the `get_imports()` function within `dynamic_module_utils.py`. This vulnerability affects versions 4.49.0 and is fixed in version 4.51.0. The issue arises from a regular expression pattern `\s*try\s*:.*?except.*?:` used to filter out try/except blocks from Python code, which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to remote code loading disruption, resource exhaustion in model serving, supply chain attack vectors, and development pipeline disruption.

## Affected packages

- `transformers < 4.51.0`

## Remediation

Upgrade to a patched release:

- `transformers 4.51.0`