CVE-2025-69227
Published: 06 January 2026
Summary
CVE-2025-69227 is a high-severity Infinite Loop (CWE-835) vulnerability in Aiohttp Aiohttp. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 23.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated exploitation of public-facing AIOHTTP server triggers application DoS via crafted POST causing infinite loop.
NVD 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…
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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.
Deeper analysisAI
CVE-2025-69227 affects AIOHTTP, an asynchronous HTTP client/server framework for asyncio and Python, in versions 3.13.2 and prior. The vulnerability enables an infinite loop when assert statements are bypassed during POST body processing, leading to a denial-of-service (DoS) condition. This issue manifests only if Python optimizations are enabled via the -O flag or PYTHONOPTIMIZE=1 environment variable, and the application includes a handler that invokes the Request.post() method. It is classified under CWE-835 (Infinite Loop) with a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
An unauthenticated attacker with network access can exploit this by sending a specially crafted POST request to a vulnerable endpoint. No user interaction or privileges are required, allowing remote exploitation against affected servers. Successful exploitation triggers the infinite loop, consuming excessive CPU resources and rendering the application unresponsive, resulting in high-impact availability disruption without compromising confidentiality or integrity.
The issue is addressed in AIOHTTP version 3.13.3. Security practitioners should upgrade to this patched release immediately. Additional details are available in the official GitHub security advisory (GHSA-jj3x-wxrx-4x23) and the fixing commit (bc1319ec3cbff9438a758951a30907b072561259).
Details
- CWE(s)