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Moderate severityGHSA Advisory· Published Jun 15, 2026· Updated Jun 15, 2026

aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

CVE-2026-54278

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.

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Patch: https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
aiohttpPyPI
< 3.14.13.14.1

Affected products

30

Patches

Vulnerability mechanics

References

2

News mentions

1