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Vulnerability record · CVE-2025-3777 · published 7 July 2025

CVE-2025-3777: Huggingface transformers improper input validation vulnerability

Huggingface · Transformers

Hugging Face Transformers versions up to 4.49.0 are affected by an improper input validation vulnerability in the `image_utils.py` file. The vulnerability arises from insecure URL validation using the `startswith()` method, which can be bypassed through URL username injection. This allows attackers to craft URLs that appear to be from YouTube but resolve to malicious domains, potentially leading to phishing attacks, malware distribution, or data exfiltration. The issue is fixed in version 4.52.1.

3.5 CVSS 3.0 Low EPSS 0.38% · top 70.8% CWE-20 · Improper input validation
3.5CVSS 3.0 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

Hugging Face Transformers versions up to 4.49.0 are affected by an improper input validation vulnerability in the `image_utils.py` file. The vulnerability arises from insecure URL validation using the `startswith()` method, which can be bypassed through URL username injection. This allows attackers to craft URLs that appear to be from YouTube but resolve to malicious domains, potentially leading to phishing attacks, malware distribution, or data exfiltration. The issue is fixed in version 4.52.1.

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

Affected products

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

References

LinkTags
https://github.com/huggingface/transformers/commit/4dda5f71b35fb70cf602187eef84bb17a50b9082 Patch
https://huntr.com/bounties/ccba0730-9248-4853-b7ff-5c20e6364f09 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-3777), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.