CVE-2026-54278
HIGHAIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
Title source: cnaDescription
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, during cleanup it is possible for a compressed request body to be decompressed into memory in one chunk. 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). This vulnerability is fixed in 3.14.1.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g3cq-j2xw-wf74
X_Refsource_Misc x_refsource_misc
https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232
Scores
CVSS v3
7.5
EPSS
0.0040
EPSS Percentile
32.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-409
Status
published
Products (2)
aio-libs/aiohttp
< 3.14.1
aiohttp/aiohttp
< 3.14.1
Published
Jun 22, 2026
Tracked Since
Jun 22, 2026