Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-47737
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 20:17:03 UTC
Updated2026-07-15 18:15:13 UTC
DescriptionPuma 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.001770000 probability, percentile 0.073880000 (date 2026-07-19)

Problem Types: CWE-290 | CWE-345 | CWE-290 CWE-290: Authentication Bypass by Spoofing | CWE-345 CWE-345: Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Puma Puma affected >= 5.5.0, < 7.2.1 Not specified
CNA Puma Puma affected >= 8.0.0, < 8.0.2 Not specified

References

ReferenceSourceLinkTags
github.com/puma/puma/pull/3947 [email protected] github.com
github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx [email protected] github.com
github.com/puma/puma/pull/3944 [email protected] github.com
github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f [email protected] github.com
github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58 [email protected] github.com
github.com/puma/puma/releases/tag/v7.2.1 [email protected] github.com
github.com/puma/puma/releases/tag/v8.0.2 [email protected] github.com
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