Description
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, ``Rack::Multipart::Parser` stores non-file form fields (parts without a `filename`) entirely in memory as Ruby `String` objects. A single large text field in a multipart/form-data request (hundreds of megabytes or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and denial of service (DoS). Attackers can send large non-file fields to trigger excessive memory usage. Impact scales with request size and concurrency, potentially leading to worker crashes or severe garbage-collection overhead. All Rack applications processing multipart form submissions are affected. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a reasonable size cap for non-file fields (e.g., 2 MiB). Workarounds include restricting maximum request body size at the web-server or proxy layer (e.g., Nginx `client_max_body_size`) and validating and rejecting unusually large form fields at the application level.
INFO
Published Date :
2025-10-07T14:42:53.366Z
Last Modified :
2025-10-07T17:52:09.399Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2025-61771 vulnerability.
| Vendors | Products |
|---|---|
| Rack |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2025-61771.
