CVE-2025-3262
MEDIUM5.3EPSS 0.32%Transformers vulnerable to ReDoS attack through its SETTING_RE variable
Published: 7/7/2025Modified: 8/4/2025
Also known as:GHSA-489j-g2vx-39wf
Description
A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the huggingface/transformers repository, specifically in version 4.49.0. The vulnerability is due to inefficient regular expression complexity in the `SETTING_RE` variable within the `transformers/commands/chat.py` file. The regex contains repetition groups and non-optimized quantifiers, leading to exponential backtracking when processing 'almost matching' payloads. This can degrade application performance and potentially result in a denial-of-service (DoS) when handling specially crafted input strings. The issue is fixed in version 4.51.0.
Affected packages (1)
- PyPI/transformers>= 4.49.0, < 4.51.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
References (5)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-3262
- PATCHhttps://github.com/huggingface/transformers
- WEBhttps://github.com/huggingface/transformers/commit/0720e206c6ba28887e4d60ef60a6a089f6c1cc76
- WEBhttps://github.com/huggingface/transformers/commit/126abe3461762e5fc180e7e614391d1b4ab051ca
- WEBhttps://huntr.com/bounties/ecf5ccc4-39e7-4fb3-b547-14a41d31a184