Denial of Service Vulnerability in Rack Web Server Interface
CVE-2025-46727

7.5HIGH

Key Information:

Vendor

Rack

Status
Rack
Vendor
CVE Published:
7 May 2025

What is CVE-2025-46727?

The Rack web server interface contains a denial of service vulnerability through Rack::QueryParser, which fails to impose limits on the number of parameters parsed from query strings and application/x-www-form-urlencoded bodies. Attackers can exploit this by sending specially crafted HTTP requests containing excessively large numbers of parameters, resulting in high memory and CPU consumption during processing. This can lead to service disruptions, requiring manual intervention or server restarts. Upgrading to versions 2.2.14, 3.0.16, or 3.1.14 mitigates this vulnerability. Employing middleware to set parameter limits or utilizing a reverse proxy like Nginx are recommended strategies to enhance security.

Affected Version(s)

rack < 2.2.14 < 2.2.14

rack >= 3.0, < 3.0.16 < 3.0, 3.0.16

rack >= 3.1, < 3.1.14 < 3.1, 3.1.14

References

https://github.com/rack/rack/security/advisories/GHSA-gjh...
x_refsource_CONFIRM
https://github.com/rack/rack/commit/2bb5263b464b65ba4b648...
x_refsource_MISC
https://github.com/rack/rack/commit/3f5a4249118d09d199fe4...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

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CVE-2025-46727 : Denial of Service Vulnerability in Rack Web Server Interface