PYSEC-2026-1986
Transformers's Improper Input Validation vulnerability can be exploited through username injection
At a glance
- Published
- Updated
- CVE
- CVE-2025-3777
- Aliases
- GHSA-phhr-52qp-3mj4
- CVSS_V3
- CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
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.
Affected packages
| Package | Versions |
|---|---|
| PyPI · transformers | introduced 0, fixed 4.52.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-3777 ADVISORY
- https://github.com/huggingface/transformers/commit/4dda5f71b35fb70cf602187eef84bb17a50b9082 WEB
- https://github.com/huggingface/transformers PACKAGE
- https://github.com/huggingface/transformers/blame/a7d2bbaaa8aac64f7c1ee8c1421cfe84b38359a4/src/transformers/image_utils.py WEB
- https://huntr.com/bounties/ccba0730-9248-4853-b7ff-5c20e6364f09 WEB
- https://pypi.org/project/transformers PACKAGE
- https://github.com/advisories/GHSA-phhr-52qp-3mj4 ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |