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CVE-2026-16756— Allocation of resources without limits in the default aws-smithy-http-server serve() path allows unauthenticated Slowloris denial of service

Quick assessment

Affected
AWS aws-smithy-http-server
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.

smithy-lang Smithy Rust是smithy-lang组织的一个Rust语言实现的模型化服务定义工具。 smithy-lang Smithy Rust 0.66.4及之前版本存在资源管理错误漏洞，该漏洞源于默认serve()路径缺少连接和标头读取超时以及并发连接限制，可能导致远程攻击者通过打开大量连接并发送从未完成的半请求，耗尽服务器套接字和任务，从而造成拒绝服务。

CVSS 7.5 · High EPSS 0.75% · P53

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS aws-smithy-http-server ≤ 0.66.4 affected
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I. Basic Information for CVE-2026-16756

Vulnerability Information
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Vulnerability Title
Allocation of resources without limits in the default aws-smithy-http-server serve() path allows unauthenticated Slowloris denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Missing connection and header-read timeouts and the absence of a concurrent-connection cap in the default serve() path of Amazon aws-smithy-http-server might allow remote attackers to cause a denial of service by opening many connections and sending partial requests that are never completed, exhausting server sockets and tasks. To mitigate this issue, users should upgrade to aws-smithy-http-server 0.66.5 or later.
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
smithy-lang Smithy Rust 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
smithy-lang Smithy Rust是smithy-lang组织的一个Rust语言实现的模型化服务定义工具。 smithy-lang Smithy Rust 0.66.4及之前版本存在资源管理错误漏洞，该漏洞源于默认serve()路径缺少连接和标头读取超时以及并发连接限制，可能导致远程攻击者通过打开大量连接并发送从未完成的半请求，耗尽服务器套接字和任务，从而造成拒绝服务。
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
AWS aws-smithy-http-server 0 ~ 0.66.4 -

II. Public POCs for CVE-2026-16756

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 8430 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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POC zip download
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III. Intelligence Information for CVE-2026-16756

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Vendor Advisories for CVE-2026-16756 (2)

Vendor Pages for CVE-2026-16756 (1)

Same Patch Batch · AWS · 2026-07-23 · 3 CVEs total

CVE-2026-16796 7.3 HIGH Improper neutralization of argument delimiters in AWS Bedrock AgentCore Python SDK install
CVE-2026-16584 7.0 HIGH AWS API MCP Server Security Policy Bypass via Startup Failure

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-770

V. Comments for CVE-2026-16756

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