TI-2025-02860 Aliases CVE-2025-3264 GHSA-jjph-296x-mrcr

Regular Expression Denial of Service (ReDoS) in huggingface/transformers

MEDIUM 63CWE-1333Published 2025-07-07 · Updated 2025-07-07

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00496 42nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed huggingface/transformers (huggingface): 4.51.0transformers (PyPI): 4.51.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
huggingface	huggingface/transformers	before 4.51.0	4.51.0	Patch available	CNA
—	transformers (PyPI)	before 4.51.0	4.51.0	Patch available	GHSA-jjph-296x-mrcr

huggingface/transformers Vendorhuggingface Affected before 4.51.0 Fixed in 4.51.0 Patch available CNA
transformers (PyPI) Vendor— Affected before 4.51.0 Fixed in 4.51.0 Patch available GHSA-jjph-296x-mrcr

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:huggingface:transformers::::::::	4.49.0 to before 4.51.0	Vulnerable	huggingface

cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:* Versions 4.49.0 to before 4.51.0 Vulnerable ·huggingface

Remediation

Fix · CNA huggingface/transformers (huggingface) Fixed in 4.51.0
Fix · GHSA-jjph-296x-mrcr transformers (PyPI) Fixed in 4.51.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2025-07-07
huggingface/transformers 4.51.0
3 records Highest priority Priority HIGH 1 HIGH, 2 MEDIUM
Other records, highest priority first
- TI-2025-02858 Regular Expression Denial of Service (ReDoS) in huggingface/transformersPriority HIGH 72
- TI-2025-02859 Regular Expression Denial of Service (ReDoS) in huggingface/transformersPriority MEDIUM 63
Show all 3 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 5 products

OpenShift Lightspeed
Red Hat AI Inference Server
Red Hat Ansible Automation Platform 2
Red Hat Enterprise Linux AI (RHEL AI)
Red Hat OpenShift AI (RHOAI)

Timeline

2026-10-02 Threatist record created from CVE-2025-3264
2026-10-03 Alias added: GHSA-jjph-296x-mrcr

References

Other 2

TI-2026-04577 Policy Bypass in LightGlue Nested Config Resolution in huggingface/transformers CVSS 3.1CRITICAL 9.6
TI-2025-06294 Regular Expression Denial of Service (ReDoS) in huggingface/transformers CVSS 3.1HIGH 7.5
TI-2025-06027 Regular Expression Denial of Service (ReDoS) in huggingface/transformers CVSS 3.1HIGH 7.5
TI-2025-02858 Regular Expression Denial of Service (ReDoS) in huggingface/transformers CVSS 3.1HIGH 7.5
TI-2025-01837 Regular Expression Denial of Service (ReDoS) in huggingface/transformers CVSS 3.1HIGH 7.5
TI-2024-11793 Regular Expression Denial of Service (ReDoS) in huggingface/transformers CVSS 3.1HIGH 7.5

See all 29 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences