CVE-2025-6051: Hugging Face Transformers ReDoS in EnglishNormalizer normalize_numbers method

Summary

CVE-2025-6051 is a Regular Expression Denial of Service (ReDoS) flaw in the `normalize_numbers()` method of the `EnglishNormalizer` class in the Hugging Face Transformers library, affecting versions up to 4.52.4. Crafted input strings containing long sequences of digits cause excessive CPU consumption, which impacts text-to-speech and number normalization tasks and can lead to service disruption and resource exhaustion.

Mitigation

Fixed in 4.53.0.

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

• transformersPyPILLM dependency since 2016-08-17 · 141 tracked dependents

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