What is the CVSS score of CVE-2025-2099?

CVE-2025-2099 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Transformers are affected by CVE-2025-2099?

Organizations using huggingface/transformers face notable risk from CVE-2025-2099 rated CVSS 7.5. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2025-2099?

Yes, a public proof-of-concept exploit is available for CVE-2025-2099. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-2099?

Within 30 days: Identify all affected systems running huggingface/transformers and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Transformers CVE-2025-2099

HIGH

Inefficient Regular Expression Complexity (ReDoS) (CWE-1333)

2025-05-19 security@huntr.dev

Denial Of Service Transformers Red Hat

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Red Hat

7.5 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:42 vuln.today

Patch released

Mar 28, 2026 - 18:42 nvd

Patch available

PoC Detected

May 21, 2025 - 17:43 vuln.today

Public exploit code

CVE Published

May 19, 2025 - 12:15 nvd

HIGH 7.5

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

12 pypi packages depend on transformers (12 direct, 0 indirect)

Ecosystem-wide dependent count for version 4.50.0.

DescriptionCVE.org

A vulnerability in the preprocess_string() function of the transformers.testing_utils module in huggingface/transformers version v4.48.3 allows for a Regular Expression Denial of Service (ReDoS) attack. The regular expression used to process code blocks in docstrings contains nested quantifiers, leading to exponential backtracking when processing input with a large number of newline characters. An attacker can exploit this by providing a specially crafted payload, causing high CPU usage and potential application downtime, effectively resulting in a Denial of Service (DoS) scenario.

AnalysisAI

A vulnerability in the preprocess_string() function of the transformers.testing_utils module in huggingface/transformers version v4.48.3 allows for a Regular Expression Denial of Service (ReDoS). Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-1333. A vulnerability in the preprocess_string() function of the transformers.testing_utils module in huggingface/transformers version v4.48.3 allows for a Regular Expression Denial of Service (ReDoS) attack. The regular expression used to process code blocks in docstrings contains nested quantifiers, leading to exponential backtracking when processing input with a large number of newline characters. An attacker can exploit this by providing a specially crafted payload, causing high CPU usage and potential application downtime, effectively resulting in a Denial of Service (DoS) scenario. Affected products include: Huggingface Transformers.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.