CVE-2025-2099

Description

A vulnerability in the `preprocess_string()` function of the `transformers.testing_utils` module in huggingface/transformers version v4.48.3 allows for a Regular Expression Denial of Service (ReDoS) attack. The regular expression used to process code blocks in docstrings contains nested quantifiers, leading to exponential backtracking when processing input with a large number of newline characters. An attacker can exploit this by providing a specially crafted payload, causing high CPU usage and potential application downtime, effectively resulting in a Denial of Service (DoS) scenario.

Reserved 2025-03-07 | Published 2025-05-19 | Updated 2025-05-19 | Assigner @huntr_ai

Problem types

CWE-1333 Inefficient Regular Expression Complexity

Product status

Any version before 4.50.0
affected

References

huntr.com/bounties/97b780f3-ffca-424f-ad5d-0e1c57a5bde4

github.com/...ommit/8cb522b4190bd556ce51be04942720650b1a3e57

cve.org (CVE-2025-2099)

nvd.nist.gov (CVE-2025-2099)

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