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CVE-2026-47736

7.5 · HIGH

Puma is a Ruby/Rack web server built for parallelism.

Published Jul 14, 2026CWE-400EPSS 0.35%

Overview

CVE-2026-47736 is a high-severity vulnerability. It was published on July 14, 2026 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

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. This issue is fixed in versions 7.2.1 and 8.0.2.

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/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889fGitHubgithub.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58GitHubgithub.com/puma/puma/releases/tag/v7.2.1GitHubgithub.com/puma/puma/releases/tag/v8.0.2GitHubgithub.com/puma/puma/security/advisories/GHSA-qpgp-93vx-g8v8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-47736?

CVE-2026-47736 is a high-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-47736?

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-2026-47736?

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-2026-47736?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-47736 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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