CVE-2026-22815 — Uncontrolled Resource Consumption in Aiohttp

CWE-400 — Uncontrolled Resource ConsumptionCWE-770 — Allocation of Resources Without Limits or Throttling8 documents7 sources
Severity
6.9MEDIUMNVD
EPSS
0.1%
top 83.69%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Aio-libs AiohttpAiohttp
Timeline
PublishedApr 1

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, insufficient restrictions in header/trailer handling could cause uncapped memory usage. This issue has been patched in version 3.13.4.

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected Packages3 packages

▶NVDaiohttp/aiohttp< 3.13.4
▶PyPIaiohttp/aiohttp< 3.13.4
▶CVEListV5aio-libs/aiohttp< 3.13.4

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

4
CVEList
AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers↗2026-04-01
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OSV
aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage↗2026-04-01
▶
GHSA
aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage↗2026-04-01
▶
OSV
CVE-2026-22815: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python↗2026-04-01
▶

📋Vendor Advisories

2
Red Hat
aiohttp: AIOHTTP: Denial of Service via insufficient header/trailer handling↗2026-04-01
▶
Debian
CVE-2026-22815: python-aiohttp - AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. ...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-22815 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-22815 — Uncontrolled Resource Consumption | cvebase