SB2026021760 - Inefficient regular expression complexity in Hugging Face Transformers library

Description

This security bulletin contains information about 1 vulnerability.

1) Inefficient regular expression complexity (CVE-ID: CVE-2025-3263)

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing untrusted input with a regular expression in the `get_configuration_file()` function within the `transformers.configuration_utils` module. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Remediation

Install update from vendor's website.

References

• https://github.com/huggingface/transformers/commit/0720e206c6ba28887e4d60ef60a6a089f6c1cc76
• https://huntr.com/bounties/c7a69150-54f8-4e81-8094-791e7a2a0f29