# CVE-2026-69244: AIOHTTP out-of-bounds heap read in C HTTP response parser

Source: https://junglewise.ai/threats/cve-2026-69244-aiohttp-out-of-bounds-heap-read-in-c-http-response-parser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-03. Updated: 2026-08-03  
License: CC BY 4.0 with a link back

CVE-2026-69244 · Severity: high · CVSS 4 · Published 2026-08-03

AIOHTTP is a popular Python library used for handling web requests. A vulnerability in its C-based response parser could allow a malicious server to crash applications using the library by sending a specially crafted, malformed response. This results in a denial-of-service (DoS) condition, potentially disrupting services that rely on AIOHTTP to fetch data.

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

## Quick answers

**Is CVE-2026-69244 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69244 being exploited in the wild.

**How severe is CVE-2026-69244?** High severity, with a CVSS score of 4, published 3 August 2026.

**Which products and versions are affected?** aiohttp (PyPI) <= 3.14.2, ECOSYSTEM:introduced=0,fixed=3.14.3.

**Is there a fix for CVE-2026-69244?** Yes. aiohttp (PyPI): upgrade to 3.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-69244 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-69244?** Check whether you run 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 3.14.3 or later

  ```sh
  pip install "aiohttp>=3.14.3"
  ```


## Technical details

An out-of-bounds (OOB) heap read vulnerability exists in the C-based HTTP response parser of AIOHTTP. The flaw is triggered during the construction of an error message when the parser encounters a malformed chunked response. A remote attacker controlling a web server can exploit this by sending a crafted response to an AIOHTTP client, leading to a process crash (Denial of Service). The vulnerability is present in versions up to and including 3.14.2 and is fixed in version 3.14.3. A workaround is available by disabling the C extensions using the environment variable AIOHTTP_NO_EXTENSIONS=1, which forces the use of the unaffected Python-based parser.

## Affected products

- aio-libs aiohttp <= 3.14.2

## Identifiers

- CVE-2026-69244
- GHSA-cq5v-8q36-5273
- PYSEC-2026-3545

## Timeline

- 2026-07-25: disclosed: Initial report to aio-libs/aiohttp
- 2026-08-03: advisory: GitHub Advisory published

## References

- [https://api.github.com/users/agners](https://api.github.com/users/agners)
- [https://github.com/agners](https://github.com/agners)
- [https://api.github.com/users/agners/gists%7B/gist_id%7D](https://api.github.com/users/agners/gists%7B/gist_id%7D)
- [https://api.github.com/users/agners/repos](https://api.github.com/users/agners/repos)
- [https://avatars.githubusercontent.com/u/34061?v=4](https://avatars.githubusercontent.com/u/34061?v=4)
- [https://api.github.com/users/agners/events%7B/privacy%7D](https://api.github.com/users/agners/events%7B/privacy%7D)

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