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CVE-2026-44909

Quick assessment

Affected
Facebook proxygen
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.

Facebook proxygen是美国Facebook公司开源的一个高性能网络库。 Facebook proxygen v2017.01.16.00至v2026.07.20.00之前版本存在资源管理错误漏洞，该漏洞源于核心HTTP会话层缺乏通用的慢消费检测机制，远程攻击者可利用HTTP/2流控制，通过将SETTINGS_INITIAL_WINDOW_SIZE设置为0或保留WINDOW_UPDATE帧，导致服务器在内存中无限缓冲完整响应体，可能导致服务降级、资源耗尽或拒绝服务。

CVSS 7.5 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Facebook proxygen v2017.01.16.00< v2026.07.20.00 affected
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I. Basic Information for CVE-2026-44909

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer. A remote, unauthenticated attacker could exploit HTTP/2 flow-control by setting SETTINGS_INITIAL_WINDOW_SIZE to 0 or withholding WINDOW_UPDATE frames, causing the server to buffer complete response bodies in memory indefinitely for stalled streams. By opening many simultaneous streams requesting large resources while preventing the server from transmitting responses, an attacker could induce unbounded memory growth leading to service degradation, resource exhaustion, or denial of service. Versions v2017.01.16.00 through v2026.07.20.00 are affected.
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
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Facebook proxygen 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Facebook proxygen是美国Facebook公司开源的一个高性能网络库。 Facebook proxygen v2017.01.16.00至v2026.07.20.00之前版本存在资源管理错误漏洞，该漏洞源于核心HTTP会话层缺乏通用的慢消费检测机制，远程攻击者可利用HTTP/2流控制，通过将SETTINGS_INITIAL_WINDOW_SIZE设置为0或保留WINDOW_UPDATE帧，导致服务器在内存中无限缓冲完整响应体，可能导致服务降级、资源耗尽或拒绝服务。
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
Facebook proxygen v2017.01.16.00 ~ v2026.07.20.00 -

II. Public POCs for CVE-2026-44909

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10040 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44909

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Patches & Fixes for CVE-2026-44909 (1)

IV. Related Vulnerabilities

Same product: proxygen
Same vendor: Facebook

V. Comments for CVE-2026-44909

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