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CVE-2025-69227— AIOHTTP vulnerable to DoS when bypassing asserts

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，该漏洞源于绕过断言语句可能导致无限循环，可能导致拒绝服务攻击。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.39% · P30

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-69227

Vulnerability Information
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Vulnerability Title
AIOHTTP vulnerable to DoS when bypassing asserts
Source: CVE Program / CVE List V5
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. 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
不可达退出条件的循环(无限循环)
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，该漏洞源于绕过断言语句可能导致无限循环，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-2025-69227

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III. Intelligence Information for CVE-2025-69227

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Patches & Fixes for CVE-2025-69227 (1)

Vendor Advisories for CVE-2025-69227 (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-2025-69226 AIOHTTP allows for a brute-force leak of internal static filepath components
CVE-2025-69229 AIOHTTP vulnerable to DoS through chunked messages
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-835

V. Comments for CVE-2025-69227

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