aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
GHSA-g3cq-j2xw-wf74 · CVE-2026-54278 · PYSEC-2026-2111
Published · Modified
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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
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