Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-47736— Puma PROXY Protocol v1 Parser Allows Remote Memory Exhaustion

Quick assessment

Affected
puma puma
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

puma是puma公司开源的一款运动服饰品牌。 Puma 5.5.0至7.2.1之前版本和8.0.0至8.0.2之前版本存在资源管理错误漏洞，该漏洞源于PROXY protocol v1支持启用时，Puma等待CRLF检测PROXY v1行期间将接收字节读入内部缓冲区，允许攻击者持续发送不含CRLF的字节导致进程内内存无限增长及频繁扫描缓冲区的额外CPU消耗。

CVSS 7.5 · High EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
puma puma >= 5.5.0, < 7.2.1 affected
>= 8.0.0, < 8.0.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-47736

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 Parser Allows Remote Memory Exhaustion
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, 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Puma 资源管理错误漏洞
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至7.2.1之前版本和8.0.0至8.0.2之前版本存在资源管理错误漏洞，该漏洞源于PROXY protocol v1支持启用时，Puma等待CRLF检测PROXY v1行期间将接收字节读入内部缓冲区，允许攻击者持续发送不含CRLF的字节导致进程内内存无限增长及频繁扫描缓冲区的额外CPU消耗。
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

Vendor Product Affected Versions CPE Subscribe
puma puma >= 5.5.0, < 7.2.1 -

II. Public POCs for CVE-2026-47736

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5839 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-2026-47736

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-47736 (3)

Vendor Advisories for CVE-2026-47736 (1)

Vendor Pages for CVE-2026-47736 (1)

IV. Related Vulnerabilities

Same product: puma
Same vendor: puma
Same weakness: CWE-400

V. Comments for CVE-2026-47736

No comments yet

Leave a comment