CVE-2025-59830
Description
Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.
How to fix
- rack rack2.2.18 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| rack rack | v < 2.2.18 | 2.2.18 |
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