CVE-2026-47737— Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections
Possible ATT&CK Techniques 1AI
T1048 · Exfiltration Over Alternative ProtocolGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-47737
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Puma 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
puma是puma公司开源的一款运动服饰品牌。 Puma 5.5.0版本至7.2.1之前版本和8.0.0版本至8.0.2之前版本存在安全漏洞，该漏洞源于在启用set_remote_address proxy_protocol: :v1并使用持久连接时，Puma错误地重新解析同一连接上每个keep-alive请求后的PROXY协议标头，导致源IP欺骗攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-47737
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9086 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month
III. Intelligence Information for CVE-2026-47737
请登录查看更多情报信息。
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-2026-72816
go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware - CVE-2026-72815
go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header - CVE-2026-6387
Lenovo system update 授权问题漏洞 - CVE-2026-53791
rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header - CVE-2026-19291
Bluetooth re-pairing can use a lower security level than pre
V. Comments for CVE-2026-47737
No comments yet