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CVE-2026-111066— AIOHTTP: File descriptor exhaustion in multipart requests

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 是一个用于 asyncio 和 Python 的异步 HTTP 客户端/服务器框架。在 2.0.0 至 3.14.4 版本中，多部分（multipart）请求处理可能保留无数量限制的文件描述符。因此，未经认证的攻击者可以通过精心构造的多部分请求，在处理器使用方法时耗尽文件描述符。该问题已在 3.14.4 版本中修复。

CVSS 8.2 · High Updated Oct 20, 2026

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

Vendor	Product	Version Range	Status
aio-libs	aiohttp	`>= 2.0.0, < 3.14.4`	affected

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Vulnerability Information

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Vulnerability Title

AIOHTTP: File descriptor exhaustion in multipart requests

Source: CVE Program / CVE List V5

Vulnerability Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. From 2.0.0 until 3.14.4, multipart request processing can retain an unbounded number of open file descriptors. An unauthenticated attacker can consequently exhaust file descriptors with specially crafted multipart requests when a handler uses Request.post(). 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:N/VA:H/SC:N/SI:N/SA:N

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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
aio-libs	aiohttp	>= 2.0.0, < 3.14.4	-

II. Public POCs for CVE-2026-111066

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-111066

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Other References for CVE-2026-111066 (3)

https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4 x_refsource_MISC
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9xw5-w5jj-pvcg x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/2d94633b7f1b4c1ba07d647b629a8440652b2d09 x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-111066

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-2026-111065	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-2026-111750	6.3 MEDIUM	AIOHTTP: Pure-Python parser request smuggling
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-400

V. Comments for CVE-2026-111066

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

CVE-2026-111066— AIOHTTP: File descriptor exhaustion in multipart requests

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 1

I. Basic Information for CVE-2026-111066

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-111066

III. Intelligence Information for CVE-2026-111066

Other References for CVE-2026-111066 (3)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-111066

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