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CVE-2025-5197

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

Published: Aug 6, 2025Updated: Oct 21, 2025 Sources: CVE List NVD GHSACWE-1333
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 72.0%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-1333

Affected Products

transformershuggingface
LibraryLibrary
AI / ML / ml-framework
huggingface/transformershuggingface
LibraryLibrary
AI / ML / ml-framework
transformersPyPIOSS Libraries
huggingfacecommercialAI / MLaka transformers, huggingface/transformers, smolagents
pypipackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/huggingface/transformers/commit/944b56000be5e9b61af8301aa340838770ad8a0b
github.com
https://huntr.com/bounties/3f8b3fd0-166b-46e7-b60f-60dd9d2678bf
huntr.com
https://nvd.nist.gov/vuln/detail/CVE-2025-5197
nvd.nist.gov
and 2 more references View all →

Timeline

Published
Aug 6, 2025
Last Updated
Oct 21, 2025

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