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CVE-2025-69229— AIOHTTP vulnerable to DoS through chunked messages

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aio-libs开源的一个开源的用于 asyncio 和 Python 的异步 HTTP 客户端/服务器框架。 aiohttp 3.13.2及之前版本存在安全漏洞，该漏洞源于处理大量分块消息时可能导致CPU过度阻塞，可能导致拒绝服务攻击。

AI Predicted 5.3 Difficulty: Easy EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-69229

Vulnerability Information
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Vulnerability Title
AIOHTTP vulnerable to DoS through chunked messages
Source: CVE Program / CVE List V5
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
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
aiohttp 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
aiohttp是aio-libs开源的一个开源的用于 asyncio 和 Python 的异步 HTTP 客户端/服务器框架。 aiohttp 3.13.2及之前版本存在安全漏洞，该漏洞源于处理大量分块消息时可能导致CPU过度阻塞，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 < 3.13.3 -

II. Public POCs for CVE-2025-69229

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III. Intelligence Information for CVE-2025-69229

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Patches & Fixes for CVE-2025-69229 (2)

Vendor Advisories for CVE-2025-69229 (1)

Same Patch Batch · aio-libs · 2026-01-05 · 8 CVEs total

CVE-2025-69223 7.5 HIGH AIOHTTP's HTTP Parser auto_decompress feature is vulnerable to zip bomb
CVE-2025-69230 AIOHTTP Vulnerable to Cookie Parser Warning Storm
CVE-2025-69227 AIOHTTP vulnerable to DoS when bypassing asserts
CVE-2025-69226 AIOHTTP allows for a brute-force leak of internal static filepath components
CVE-2025-69225 AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields
CVE-2025-69224 AIOHTTP's Unicode processing of header values could cause parsing discrepancies
CVE-2025-69228 AIOHTTP vulnerable to denial of service through large payloads

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-770

V. Comments for CVE-2025-69229

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