CVE-2026-47737
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| puma | puma | >= 5.5.0, < 7.2.1 | affected |
| puma | puma | >= 8.0.0, < 8.0.2 | affected |
Weaknesses
- CWE-290: CWE-290: Authentication Bypass by Spoofing
- CWE-345: CWE-345: Insufficient Verification of Data Authenticity
References
- https://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx
- https://github.com/puma/puma/pull/3944
- https://github.com/puma/puma/pull/3947
- https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f
- https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58
- https://github.com/puma/puma/releases/tag/v7.2.1
- https://github.com/puma/puma/releases/tag/v8.0.2
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