GHSA-g3cq-j2xw-wf74

aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-54278

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	aiohttp	< 3.14.1	3.14.1

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary During cleanup it is possible for a compressed request body to be decompressed into memory in one chunk. ### Impact An attacker may be able to send a compressed payload in specific situations that could be decompressed into memory, potentially leading to DoS (a zip bomb edge case). ### Workaround Disable compression if unable to upgrade. ----- Patch: https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232

References

External links from the advisory. They lead to third-party sites.

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g3cq-j2xw-wf74 web
https://github.com/aio-libs/aiohttp package