AI agent vulnerability · Transformers

CVE-2024-12720: Transformers Regular Expression Denial of Service (ReDoS) vulnerability

mediumCVSS 3.0 5.3GHSA-6rvg-6v2m-4j46

A Regular Expression Denial of Service (ReDoS) vulnerability was identified in the huggingface/transformers library, specifically in the file tokenizationnougatfast.py. The vulnerability occurs in the postprocesssingle() function, where a regular expression processes specially crafted input.

Published Mar 20, 2025 · Updated Mar 21, 2025

Affected packages

transformers

Ecosystem: PyPI
Affected: < 4.48.0
Fixed in: 4.48.0
Check: pip show transformers

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

A Regular Expression Denial of Service (ReDoS) vulnerability was identified in the huggingface/transformers library, specifically in the file tokenization_nougat_fast.py. The vulnerability occurs in the post_process_single() function, where a regular expression processes specially crafted input. The issue stems from the regex exhibiting exponential time complexity under certain conditions, leading to excessive backtracking. This can result in significantly high CPU usage and potential application downtime, effectively creating a Denial of Service (DoS) scenario. The affected version is v4.46.3.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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