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PYSEC-2026-1109
AIOHTTP has unicode match groups in regexes for ASCII protocol elements
Quick fix
PYSEC-2026-1109 — aiohttp: upgrade to the fixed version with the command below.
pip install --upgrade 'aiohttp>=3.13.3'Details
### Summary
The parser allows non-ASCII decimals to be present in the Range header.
### Impact
There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability.
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Patch: https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mqqc-3gqh-h2x8[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2025-69225[ADVISORY]
- https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96[FIX]
- https://github.com/aio-libs/aiohttp[PACKAGE]
- https://pypi.org/project/aiohttp[PACKAGE]
- https://github.com/advisories/GHSA-mqqc-3gqh-h2x8[ADVISORY]