Transformers vulnerable to ReDoS attack through its get_imports() function
Medium5.3CVE-2025-3264 · Published Jul 7, 2025 · updated Jul 7, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| transformers PyPI | < 4.51.0 | 4.51.0 |
Details and references
A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically in the `get_imports()` function within `dynamic_module_utils.py`. This vulnerability affects versions 4.49.0 and is fixed in version 4.51.0. The issue arises from a regular expression pattern `\s*try\s*:.*?except.*?:` used to filter out try/except blocks from Python code, which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to remote code loading disruption, resource exhaustion in model serving, supply chain attack vectors, and development pipeline disruption.
- CVSS 3.0
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-1333
- Also known as
- CVE-2025-3264, PYSEC-2026-1985
More Transformers advisories
All Transformers| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jul 72025 | Transformers vulnerable to ReDoS attack through its SETTING_RE variable CVE-2025-3262Medium5.3fixed in 4.51.0 | Medium5.3 | 4.51.0 |
| Jul 72025 | Transformers's Improper Input Validation vulnerability can be exploited through username injection CVE-2025-3777Low3.5fixed in 4.52.1 | Low3.5 | 4.52.1 |
| Jul 72025 | Transformers's ReDoS vulnerability in get_configuration_file can lead to catastrophic backtracking CVE-2025-3263Medium5.3fixed in 4.51.0 | Medium5.3 | 4.51.0 |
| Jul 112025 | Transformers is vulnerable to ReDoS attack through its DonutProcessor class CVE-2025-3933Medium5.3fixed in 4.52.1 | Medium5.3 | 4.52.1 |
| Aug 62025 | Hugging Face Transformers Regular Expression Denial of Service (ReDoS) vulnerability CVE-2025-5197Medium5.3fixed in 4.53.0 | Medium5.3 | 4.53.0 |
| May 192025 | Hugging Face Transformers Regular Expression Denial of Service CVE-2025-2099Medium5.3fixed in 4.50.0 | Medium5.3 | 4.50.0 |