Request Smuggling Vulnerability in AIOHTTP Framework by Aio-libs
CVE-2025-69224

6.3MEDIUM

Key Information:

Vendor

Aio-libs

Status
Aiohttp
Vendor
CVE Published:
5 January 2026

What is CVE-2025-69224?

The AIOHTTP framework, designed for asynchronous HTTP communication in Python, is susceptible to a request smuggling vulnerability. This issue arises in versions up to 3.13.2, particularly when handling non-ASCII characters. If installed in its pure Python version—without C extensions—or if AIOHTTP_NO_EXTENSIONS is enabled, attackers can exploit this vulnerability to bypass firewall or proxy protections. The problem has been resolved in versions released after 3.13.2.

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Affected Version(s)

aiohttp < 3.13.3

References

https://github.com/aio-libs/aiohttp/security/advisories/G...
x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/32677f2adfd907...
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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