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With package: rubyPackages_4_0.puma

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Untriaged

Permalink CVE-2026-47736

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): None (N)
Availability (A): High (H)
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): None (N)
Modified Availability (MA): High (H)

created 1 day, 16 hours ago Activity log

Created suggestion 1 day, 16 hours ago

Puma PROXY Protocol v1 Parser Allows Remote Memory Exhaustion

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. This issue is fixed in versions 7.2.1 and 8.0.2.

References

https://github.com/puma/puma/security/advisories/GHSA-qpgp-93vx-g8v8 x_refsource_CONFIRM
https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f x_refsource_MISC
https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58 x_refsource_MISC
https://github.com/puma/puma/releases/tag/v7.2.1 x_refsource_MISC
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

Matching in nixpkgs

pkgs.rubyPackages.puma

None

nixos-unstable 7.1.0
- nixpkgs-unstable 7.1.0
- nixos-unstable-small 7.1.0
nixos-26.05 7.1.0
- nixos-26.05-small 7.1.0
- nixpkgs-26.05-darwin 7.1.0

pkgs.rubyPackages_3_3.puma

None

nixos-unstable 7.1.0
- nixpkgs-unstable 7.1.0
- nixos-unstable-small 7.1.0
nixos-26.05 7.1.0
- nixos-26.05-small 7.1.0
- nixpkgs-26.05-darwin 7.1.0

pkgs.rubyPackages_3_4.puma

None

nixos-unstable 7.1.0
- nixpkgs-unstable 7.1.0
- nixos-unstable-small 7.1.0
nixos-26.05 7.1.0
- nixos-26.05-small 7.1.0
- nixpkgs-26.05-darwin 7.1.0

pkgs.rubyPackages_4_0.puma

None

nixos-unstable 7.1.0
- nixpkgs-unstable 7.1.0
- nixos-unstable-small 7.1.0
nixos-26.05 7.1.0
- nixos-26.05-small 7.1.0
- nixpkgs-26.05-darwin 7.1.0

Untriaged

Permalink 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)

created 1 day, 16 hours ago Activity log

Created suggestion 1 day, 16 hours ago

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.