# CVE-2025-69227: PYSEC-2026-1107 - AIOHTTP vulnerable to DoS when bypassing asserts

Source: https://junglewise.ai/threats/cve-2025-69227-aiohttp-vulnerable-to-dos-when-bypassing-asserts  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-06  
License: CC BY 4.0 with a link back

CVE-2025-69227 · Severity: high · CVSS 7.5 · Published 2026-01-06

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.

Technologies: [Aiohttp](https://junglewise.ai/threats/technologies/aiohttp-aiohttp), [aiohttp (PyPI)](https://junglewise.ai/threats/technologies/aiohttp). Vendors: [Aiohttp](https://junglewise.ai/threats/vendors/aiohttp), [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-69227 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-69227 being exploited in the wild.

**How severe is CVE-2025-69227?** High severity, with a CVSS score of 7.5, published 6 January 2026.

**Which products and versions are affected?** aiohttp (PyPI) ECOSYSTEM:introduced=0,fixed=3.13.3.

**Is there a fix for CVE-2025-69227?** Yes. aiohttp (PyPI): upgrade to 3.13.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-69227?** Check whether you run Aiohttp or aiohttp (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- aiohttp (PyPI): upgrade to 3.13.3 or later

  ```sh
  pip install "aiohttp>=3.13.3"
  ```


## Affected products

- Aiohttp
- aiohttp (PyPI) ECOSYSTEM:introduced=0,fixed=3.13.3

## Identifiers

- CVE-2025-69227
- GHSA-jj3x-wxrx-4x23
- PYSEC-2026-1107

## Related threats

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- [aiohttp Request scheme manipulation in absolute-form requests](https://junglewise.ai/threats/cve-2026-111748-aiohttp-is-an-asynchronous-http-client-server-framework-for)
- [AIOHTTP multipart request file descriptor exhaustion](https://junglewise.ai/threats/cve-2026-111066-aiohttp-is-an-asynchronous-http-client-server-framework-for)
- [aiohttp cookie Max-Age integer overflow causes connection pool exhaustion](https://junglewise.ai/threats/cve-2026-111065-aiohttp-is-an-asynchronous-http-client-server-framework-for)