What is CVE-2025-3933?

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically within the DonutProcessor class's `token2json()` method. This vulnerability affects versions 4.50.3 and earlier, and is fixed in version 4.52.1. The issue arises from the regex pattern ` ` which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to service disruption, resource exhaustion, and potential API service vulnerabilities, impacting document processing tasks using the Donut model.

How severe is CVE-2025-3933?

CVE-2025-3933 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-3933 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-3933?

CVE-2025-3933 affects Huggingface Transformers. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-3933?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-3933 have an EU (EUVD) identifier?

Yes. CVE-2025-3933 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21126.

When was CVE-2025-3933 published?

CVE-2025-3933 was published on 2025-07-11 and last updated on 2026-06-17.

CVE-2025-3933

CVE-2025-3933 is a medium-severity vulnerability in Huggingface Transformers with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1333.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-21126
Weakness: CWE-1333
Affected product: Huggingface Transformers
Published: 2025-07-11
Last modified: 2026-06-17

Description

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically within the DonutProcessor class's `token2json()` method. This vulnerability affects versions 4.50.3 and earlier, and is fixed in version 4.52.1. The issue arises from the regex pattern `<s_(.*?)>` which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to service disruption, resource exhaustion, and potential API service vulnerabilities, impacting document processing tasks using the Donut model.

Frequently asked questions

What is CVE-2025-3933?: A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically within the DonutProcessor class's `token2json()` method. This vulnerability affects versions 4.50.3 and earlier, and is fixed in version 4.52.1. The issue arises from the regex pattern `<s_(.*?)>` which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to service disruption, resource exhaustion, and potential API service vulnerabilities, impacting document processing tasks using the Donut model.
How severe is CVE-2025-3933?: CVE-2025-3933 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-3933 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-3933?: CVE-2025-3933 affects Huggingface Transformers. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-3933?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-3933 have an EU (EUVD) identifier?: Yes. CVE-2025-3933 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21126.
When was CVE-2025-3933 published?: CVE-2025-3933 was published on 2025-07-11 and last updated on 2026-06-17.

References

Affected products (1)

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

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