GHSA-g3cq-j2xw-wf74

aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

At a glance

Published: 2026-06-15 20:09 UTC
Updated: 2026-09-10 03:51 UTC
CVE: CVE-2026-54278
Aliases: PYSEC-2026-2111
CVSS_V4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

Description

### 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

Affected packages

Package	Versions
PyPI · aiohttp	introduced 0, fixed 3.14.1

References

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

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — GitHub Advisory Database