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Vulnerability record · CVE-2026-47737 · published 14 July 2026

CVE-2026-47737: Authentication bypass by spoofing vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.27% · top 83.4% CWE-290 · Authentication bypass by spoofingCWE-345 · Insufficient verification of data authenticity Deferred
7.5CVSS 3.1 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
15 Jul 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f
https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58
https://github.com/puma/puma/pull/3944
https://github.com/puma/puma/pull/3947
https://github.com/puma/puma/releases/tag/v7.2.1
https://github.com/puma/puma/releases/tag/v8.0.2
https://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx

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Source: NIST National Vulnerability Database (record CVE-2026-47737), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.