CVE-2026-54278Medium▾ Sunlitaiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.4%
Last analysed / modified upstream
0.4% → 0.5%
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).
Disable compression if unable to upgrade.
Patch: https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232
aiohttp < 3.14.1Upgrade to a patched release:
aiohttp 3.14.1Connected by shared product, vendor, weakness, or advisory.
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