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PYSEC-2026-1107
AIOHTTP vulnerable to DoS when bypassing asserts
Quick fix
PYSEC-2026-1107 — aiohttp: upgrade to the fixed version with the command below.
pip install --upgrade 'aiohttp>=3.13.3'Details
### Summary When assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body.
### Impact If optimisations 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.
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Patch: https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jj3x-wxrx-4x23[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2025-69227[ADVISORY]
- https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259[WEB]
- https://github.com/aio-libs/aiohttp[PACKAGE]
- https://pypi.org/project/aiohttp[PACKAGE]
- https://github.com/advisories/GHSA-jj3x-wxrx-4x23[ADVISORY]