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CVE-2026-111750— AIOHTTP: Pure-Python parser request smuggling

Quick assessment

Affected
aio-libs aiohttp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AIOHTTP 是一个基于 asyncio 和 Python 的异步 HTTP 客户端/服务器框架。在 3.14.4 版本之前，其纯 Python 解析器会接受存在歧义的 HTTP 请求分帧（framing）。因此，当应用程序使用 AIOHTTP_NO_EXTENSIONS 环境变量，或未安装标准 wheel 包运行，且中间设备对分帧的解析方式与 AIOHTTP 不一致时，未认证的攻击者可以利用此问题进行请求走私（request smuggling）。该问题已在 3.14.4 版本中修复。

CVSS 6.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
aio-libs aiohttp < 3.14.4 affected
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I. Basic Information for CVE-2026-111750

Vulnerability Information
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Vulnerability Title
AIOHTTP: Pure-Python parser request smuggling
Source: CVE Program / CVE List V5
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the pure Python parser accepts ambiguous HTTP request framing. An unauthenticated attacker can consequently smuggle requests when an application uses AIOHTTP_NO_EXTENSIONS or otherwise runs without a standard wheel and an intermediary interprets the framing differently. This issue is fixed in version 3.14.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
aio-libs aiohttp < 3.14.4 -

II. Public POCs for CVE-2026-111750

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III. Intelligence Information for CVE-2026-111750

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Other References for CVE-2026-111750 (3)

Same Patch Batch · aio-libs · 2026-10-19 · 7 CVEs total

CVE-2026-111064 8.2 HIGH aiohttp server lacks an initial request/header timeout
CVE-2026-111066 8.2 HIGH AIOHTTP: File descriptor exhaustion in multipart requests
CVE-2026-111065 6.9 MEDIUM AIOHTTP: Connector pool exhaustion via Max-Age overflow
CVE-2026-111063 6.3 MEDIUM AIOHTTP: Secure attribute not enforced for shared cookie
CVE-2026-111748 6.3 MEDIUM AIOHTTP: Absolute-form request targets can spoof Request.scheme
CVE-2026-111749 2.3 LOW AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-444

V. Comments for CVE-2026-111750

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