AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-cq5v-8q36-5273 AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 12 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

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'}

threat_severity

Important


Tue, 04 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 03 Aug 2026 23:00:00 +0000

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

Mon, 03 Aug 2026 21:15:00 +0000

Type Values Removed Values Added
Description AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.
Title AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)
Weaknesses CWE-125
CWE-400
CWE-416
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-04T14:13:17.355Z

Reserved: 2026-08-03T19:54:19.852Z

Link: CVE-2026-69244

cve-icon Vulnrichment

Updated: 2026-08-04T14:13:13.978Z

cve-icon NVD

Status : Received

Published: 2026-08-03T21:16:42.273

Modified: 2026-08-04T15:16:42.507

Link: CVE-2026-69244

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-03T20:50:59Z

Links: CVE-2026-69244 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-04T09:45:03Z

Weaknesses