CVEvulnerability

CVE-2026-47737

7.5 HIGH Published 2026-07-14 Modified 2026-07-15 Official page ↗

Status: Deferred
Published: 2026-07-14
Last modified: 2026-07-15
Assigner: [email protected]
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses: CWE-290, CWE-345

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.

Weakness · CWE (2)

CWE-290 Authentication Bypass by Spoofing weakness
CWE-345 Insufficient Verification of Data Authenticity weakness

References

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

CVE-2026-47737

Description

Related

Weakness · CWE (2)

References