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CVE-2026-69244— AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)

Quick assessment

Affected
aio-libs aiohttp
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.

aio-libs Async http client/server framework是aio-libs组织的一款异步HTTP客户端/服务器框架。 aio-libs Async http client/server framework 3.14.3之前版本存在安全漏洞，该漏洞源于C响应解析器在构建错误消息时存在越界堆读取，可能导致拒绝服务攻击。

CVSS 7.1 · High EPSS 0.53% · P42

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
aio-libs aiohttp < 3.14.3 affected
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I. Basic Information for CVE-2026-69244

Vulnerability Information
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Vulnerability Title
AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)
Source: CVE Program / CVE List V5
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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
Vulnerability Title
aio-libs Async http client/server framework 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
aio-libs Async http client/server framework是aio-libs组织的一款异步HTTP客户端/服务器框架。 aio-libs Async http client/server framework 3.14.3之前版本存在安全漏洞，该漏洞源于C响应解析器在构建错误消息时存在越界堆读取，可能导致拒绝服务攻击。
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
aio-libs aiohttp < 3.14.3 -

II. Public POCs for CVE-2026-69244

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9458 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-69244

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Patches & Fixes for CVE-2026-69244 (2)

Vendor Advisories for CVE-2026-69244 (1)

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-400

V. Comments for CVE-2026-69244

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