CVE-2025-59830

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published9/25/2025

Last Modified10/10/2025

Sourcenvd

Honeypot Sightings0

Affected Products

rack:rack

Weaknesses (CWE)

CWE-400CWE-770

References

https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71(security-advisories@github.com)

https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm(security-advisories@github.com)

IOC Correlations

No correlations recorded

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