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CVE-2026-47737
7.5 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): High (H)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): None (N)
Activity log
- Created suggestion
Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections
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.
References
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https://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx x_refsource_CONFIRM
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https://github.com/puma/puma/pull/3944 x_refsource_MISC
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https://github.com/puma/puma/pull/3947 x_refsource_MISC
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https://github.com/puma/puma/releases/tag/v7.2.1 x_refsource_MISC
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https://github.com/puma/puma/releases/tag/v8.0.2 x_refsource_MISC
Affected products
puma
- ==>= 5.5.0, < 7.2.1
- ==>= 8.0.0, < 8.0.2