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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-47737 Detail

Description

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, Puma is vulnerable to source IP spoofing when set_remote_address proxy_protocol: :v1 is enabled and persistent connections are used because Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection, allowing an attacker to inject a second PROXY header and overwrite REMOTE_ADDR. This issue is fixed in versions 7.2.1 and 8.0.2.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f GitHub, Inc.
https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58 GitHub, Inc.
https://github.com/puma/puma/pull/3944 GitHub, Inc.
https://github.com/puma/puma/pull/3947 GitHub, Inc.
https://github.com/puma/puma/releases/tag/v7.2.1 GitHub, Inc.
https://github.com/puma/puma/releases/tag/v8.0.2 GitHub, Inc.
https://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-290 Authentication Bypass by Spoofing GitHub, Inc.  
CWE-345 Insufficient Verification of Data Authenticity GitHub, Inc.  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-47737
NVD Published Date:
07/14/2026
NVD Last Modified:
07/14/2026
Source:
GitHub, Inc.