GitHub Advisoryadvisory · PyPI

GHSA-g3cq-j2xw-wf74 aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

MEDIUM Published 2026-06-15 Modified 2026-06-15 Official page ↗
Aliases
CVE-2026-54278
Ecosystem
PyPI
Packages
aiohttp
Severity
Moderate
CVSS vector
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
Weaknesses
CWE-409
Reviewed
2026-06-15

Affected packages

• PyPI aiohttp: < 3.14.1 → fixed in 3.14.1

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

Related

Alias · CVE (1)

  • CVE-2026-54278 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. vulnerability

Weakness · CWE (1)

  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification) weakness

References