CVE-2025-69228
Published: 06 January 2026
Summary
CVE-2025-69228 is a medium-severity Allocation of Resources Without Limits or Throttling (CWE-770) vulnerability in Aiohttp Aiohttp. Its CVSS base score is 6.6 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 21.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SC-6 (Resource Availability).
Deeper analysis
CVE-2025-69228 is a denial-of-service vulnerability in AIOHTTP, an asynchronous HTTP client/server framework for asyncio and Python. Affected versions are 3.13.2 and earlier, where a specially crafted request can cause the server's memory to fill up uncontrollably during processing. This occurs specifically if an application includes a handler that uses the Request.post() method, leading to potential server freezing due to memory exhaustion. The issue is classified under CWE-770 (Allocation of Resources Without Limits or Throttling) 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).
The vulnerability can be exploited remotely by any unauthenticated attacker with network access to the AIOHTTP server. By sending a maliciously crafted request, the attacker triggers excessive memory allocation in the server's request processing logic, resulting in resource exhaustion and denial of service. No user interaction is required, and the attack has low complexity, making it feasible for remote attackers to repeatedly target vulnerable servers and render them unresponsive.
Mitigation is available through upgrading to AIOHTTP version 3.13.3, which addresses the issue. The official security advisory (GHSA-6jhg-hg63-jvvf) and the fixing commit (b7dbd35375aedbcd712cbae8ad513d56d11cce60) on the aio-libs/aiohttp GitHub repository provide detailed patch information for developers.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-1044
Vulnerability details
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow a request to be crafted in such a way that an AIOHTTP server's memory fills up uncontrollably during processing. If an application includes a…
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handler that uses the Request.post() method, an attacker may be able to freeze the server by exhausting the memory. This issue is fixed in version 3.13.3.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct remote DoS via application exploitation causing memory exhaustion (CWE-770).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires timely patching of the AIOHTTP flaw in versions <=3.13.2, directly eliminating the memory exhaustion vulnerability via crafted POST requests.
Implements denial-of-service protections such as request throttling and size limits at entry points to block crafted requests causing server memory exhaustion.
Enforces resource allocation limits, including memory, to prevent uncontrolled exhaustion during processing of malicious requests as per CWE-770.