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CVE-2025-61919

7.5 · HIGH

Rack is a modular Ruby web server interface.

Published Oct 10, 2025CWE-400EPSS 0.65%

Overview

CVE-2025-61919 is a high-severity vulnerability. It was published on October 10, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/rack/rack/commit/4e2c903991a790ee211a3021808ff4fd6fe82881GitHubgithub.com/rack/rack/commit/cbd541e8a3d0c5830a3c9a30d3718ce2e124f9dbGitHubgithub.com/rack/rack/commit/e179614c4a653283286f5f046428cbb85f21146fGitHubgithub.com/rack/rack/security/advisories/GHSA-6xw4-3v39-52mm

How CyberStrike helps

Frequently asked questions

What is CVE-2025-61919?

CVE-2025-61919 is a high-severity vulnerability. It was published on October 10, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-61919?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-61919?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-61919?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-61919 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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