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Vulnerabilities CVE-2026-69244

CVE-2026-69244

High
Open
TLP:CLEAR

AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)

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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.

Details

CVSS Score
7.1
EPSS Score
0.30%

22.4th percentile

CVSS 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
Confidence
90%
Published
Aug 3, 2026
Last Modified
Aug 4, 2026
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