Input validation error in transformers - CVE-2025-3777
Published: February 17, 2026
Vulnerability identifier: #VU123001
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-3777
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: huggingface
Affected software:
transformers
transformers
Detailed vulnerability description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to from insecure URL validation using the `startswith()` method, which can be bypassed through URL username injection. A remote user can trick the victim into opening a specially crafted URLs that appear to be from YouTube but resolve to malicious domains, potentially leading to phishing attacks, malware distribution, or data exfiltration.
How to mitigate CVE-2025-3777
Install updates from vendor's website.