CVE-2026-47737— Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-47737
Vulnerability Information
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Vulnerability Title
Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用欺骗进行的认证绕过
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-47737
| # | POC Description | Source Link | Shenlong Link |
|---|
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Qwen3.6-35B-A3B · 9086 chars
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III. Intelligence Information for CVE-2026-47737
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Patches & Fixes for CVE-2026-47737 (5)
Vendor Advisories for CVE-2026-47737 (1)
Vendor Pages for CVE-2026-47737 (1)
IV. Related Vulnerabilities
Same product: puma
- CVE-2026-47736
Puma PROXY Protocol v1 Parser Allows Remote Memory Exhaustio - CVE-2024-45614
Header normalization allows for client to clobber proxy set - CVE-2024-21647
HTTP Request/Response Smuggling in puma - CVE-2023-40175
Inconsistent Interpretation of HTTP Requests in puma - CVE-2022-24790
HTTP Request Smuggling in puma
Same vendor: puma
- CVE-2026-47736
Puma PROXY Protocol v1 Parser Allows Remote Memory Exhaustio - CVE-2024-45614
Header normalization allows for client to clobber proxy set - CVE-2024-21647
HTTP Request/Response Smuggling in puma - CVE-2023-40175
Inconsistent Interpretation of HTTP Requests in puma - CVE-2022-24790
HTTP Request Smuggling in puma
Same weakness: CWE-290
- CVE-2026-49353
9Router: Local-Only Access Gate Bypass in 9router via Host H - CVE-2026-12382
Aap-gateway: missing requestheaderstoremove allows mtls bypa - CVE-2026-45063
Symfony: Identity Spoofing via Unanchored DN Regex in X509Au - CVE-2026-45074
Symfony: Cas2Handler Derives CAS service URL from Client Hos - CVE-2026-62644
Roundcube Webmail 会话数据用户名伪造致账号接管
V. Comments for CVE-2026-47737
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