CVE-2026-54278: aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

June 15, 2026

During cleanup it is possible for a compressed request body to be decompressed into memory in one chunk.

References

github.com/advisories/GHSA-g3cq-j2xw-wf74
github.com/aio-libs/aiohttp/security/advisories/GHSA-g3cq-j2xw-wf74
nvd.nist.gov/vuln/detail/CVE-2026-54278

Code Behaviors & Features

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