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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0004.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Aio-libs Subscribe
Aiohttp Subscribe

No data.

No data.

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Vendors Products
Aio-libs Subscribe
Aiohttp Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-w2fm-2cpv-w7v5 aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/aio-libs/aiohttp/commit/0c2e9da51126238a421568eb7c5b53e5b5d17b36 cve-icon cve-icon cve-icon
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4 cve-icon cve-icon cve-icon
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-w2fm-2cpv-w7v5 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-22815 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-22815 cve-icon
History

Sat, 04 Apr 2026 03:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Thu, 02 Apr 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Aio-libs
Aio-libs aiohttp
Vendors & Products Aio-libs
Aio-libs aiohttp

Thu, 02 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Moderate

Wed, 01 Apr 2026 23:45:00 +0000

Type Values Removed Values Added
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.
Title AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers
Weaknesses CWE-400
CWE-770
References
Metrics cvssV4_0

{'score': 6.9, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-04T03:10:24.396Z

Reserved: 2026-01-09T22:50:10.288Z

Link: CVE-2026-22815

cve-icon Vulnrichment

Updated: 2026-04-04T03:10:17.025Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-04-01T21:16:58.513

Modified: 2026-04-04T04:17:11.500

Link: CVE-2026-22815

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-04-01T20:08:08Z

Links: CVE-2026-22815 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-02T20:16:45Z

Weaknesses