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Vulnerability record · CVE-2025-5197 · published 6 August 2025

CVE-2025-5197: Huggingface transformers inefficient regular expression (redos) vulnerability

Huggingface · Transformers

A Regular Expression Denial of Service (ReDoS) vulnerability exists in the Hugging Face Transformers library, specifically in the `convert_tf_weight_name_to_pt_weight_name()` function. This function, responsible for converting TensorFlow weight names to PyTorch format, uses a regex pattern `/[^/]*___([^/]*)/` that can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. The vulnerability affects versions up to 4.51.3 and is fixed in version 4.53.0. This issue can lead to service disruption, resource exhaustion, and potential API service vulnerabilities, impacting model conversion processes between TensorFlow and PyTorch formats.

5.3 CVSS 3.0 Medium EPSS 0.40% · top 68.9% CWE-1333 · Inefficient regular expression (ReDoS)
5.3CVSS 3.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A Regular Expression Denial of Service (ReDoS) vulnerability exists in the Hugging Face Transformers library, specifically in the `convert_tf_weight_name_to_pt_weight_name()` function. This function, responsible for converting TensorFlow weight names to PyTorch format, uses a regex pattern `/[^/]*___([^/]*)/` that can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. The vulnerability affects versions up to 4.51.3 and is fixed in version 4.53.0. This issue can lead to service disruption, resource exhaustion, and potential API service vulnerabilities, impacting model conversion processes between TensorFlow and PyTorch formats.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/huggingface/transformers/commit/944b56000be5e9b61af8301aa340838770ad8a0b Patch
https://huntr.com/bounties/3f8b3fd0-166b-46e7-b60f-60dd9d2678bf ExploitIssue TrackingPatchThird Party Advisory
https://huntr.com/bounties/3f8b3fd0-166b-46e7-b60f-60dd9d2678bf ExploitIssue TrackingPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-5197), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.