A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the huggingface/transformers repository, specifically in version 4.49.0. The vulnerability is due to inefficient regular expression complexity in the `SETTING_RE` variable within the `transformers/commands/chat.py` file. The regex contains repetition groups and non-optimized quantifiers, leading to exponential backtracking when processing 'almost matching' payloads. This can degrade application performance and potentially result in a denial-of-service (DoS) when handling specially crafted input strings. The issue is fixed in version 4.51.0.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00132.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
huggingface huggingface/transformers affected
Version Status Constraints
unspecified affected
< 4.51.0

Configuration 1 [-]

cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:*

No data.

Vendor Product Confidence Versions
Huggingface Transformers — —

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2025-20217 Transformers vulnerable to ReDoS attack through its SETTING_RE variable
Github GHSA Github GHSA GHSA-489j-g2vx-39wf Transformers vulnerable to ReDoS attack through its SETTING_RE variable
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/huggingface/transformers/commit/0720e206c6ba28887e4d60ef60a6a089f6c1cc76 cve-icon cve-icon cve-icon
https://huntr.com/bounties/ecf5ccc4-39e7-4fb3-b547-14a41d31a184 cve-icon cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-3262 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-3262 cve-icon
History

Sat, 02 Aug 2025 01:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Sun, 13 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00042}

 epss

{'score': 0.00055}

Tue, 08 Jul 2025 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Moderate

Mon, 07 Jul 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 07 Jul 2025 10:00:00 +0000

Type Values Removed Values Added
Description A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the huggingface/transformers repository, specifically in version 4.49.0. The vulnerability is due to inefficient regular expression complexity in the `SETTING_RE` variable within the `transformers/commands/chat.py` file. The regex contains repetition groups and non-optimized quantifiers, leading to exponential backtracking when processing 'almost matching' payloads. This can degrade application performance and potentially result in a denial-of-service (DoS) when handling specially crafted input strings. The issue is fixed in version 4.51.0.
Title Regular Expression Denial of Service (ReDoS) in huggingface/transformers
Weaknesses CWE-1333
References
Metrics cvssV3_0

{'score': 5.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}
cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2025-07-07T15:19:42.413Z

Reserved: 2025-04-04T12:40:28.677Z

Link: CVE-2025-3262

cve-icon Vulnrichment

Updated: 2025-07-07T15:19:29.051Z

cve-icon NVD

Status : Analyzed

Published: 2025-07-07T10:15:27.200

Modified: 2025-08-02T01:20:02.673

Link: CVE-2025-3262

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-07-07T09:54:39Z

Links: CVE-2025-3262 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-07-13T21:47:26Z

Weaknesses