# CVE-2025-69225: PYSEC-2026-1109 - AIOHTTP has unicode match groups in regexes for ASCII protocol elements

Source: https://junglewise.ai/threats/cve-2025-69225-aiohttp-has-unicode-match-groups-in-regexes-for-ascii-protocol  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-06  
License: CC BY 4.0 with a link back

CVE-2025-69225 · Severity: medium · CVSS 5.3 · Published 2026-01-06

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. 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-2025-69225 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-69225 being exploited in the wild.

**How severe is CVE-2025-69225?** Medium severity, with a CVSS score of 5.3, 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-2025-69225?** 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-2025-69225?** 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-2025-69225
- GHSA-mqqc-3gqh-h2x8
- PYSEC-2026-1109

## Related threats

- [aiohttp HTTP request smuggling in pure Python parser](https://junglewise.ai/threats/cve-2026-111750-aiohttp-is-an-asynchronous-http-client-server-framework-for)
- [aiohttp host-only cookie scope bypass in subdomain handling](https://junglewise.ai/threats/cve-2026-111749-aiohttp-is-an-asynchronous-http-client-server-framework-for)
- [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)