aio-libs/aiohttp · Security
aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
- GHSA ID
- GHSA-g3cq-j2xw-wf74
- CVE ID
- CVE-2026-54278
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.6 · 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
CWEs
- CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)