CVE-2026-54278: medium-severity vulnerability in aio-libs aiohttp
AIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
Published · Updated
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.6epss 0.5%
exploitation probability
0.5%top 60% of all CVEs
observed exploitation
nono source reports it
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.
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
Affected products
aio-libs · aiohttpRelated CVEs — aio-libs aiohttp
In the same product, most dangerous first.
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