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CVE-2026-54278

AIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

Published: Jun 22, 2026Updated: Jun 26, 2026 Sources: CVE List NVDCWE-409
7.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 67.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, 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). This vulnerability is fixed in 3.14.1.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-409

Affected Products

aiohttp
oss-project
aiohttpLibrary
OSS Libraries / web-framework
aio-libs
oss-projectaka aiohttp session, aiosmtpd, aiohttp
aiohttpLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available
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References

https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232
github.com
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g3cq-j2xw-wf74
github.com

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