PT-2026-67521 · Pypi · Aiohttp

CVE-2026-69244 · Published 2026-08-03 · Updated 2026-08-03

Positive Technologies (AI Summary)

CVSS v4.0

7.1

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions AIOHTTP versions prior to 3.14.3

Description An out-of-bounds heap read can occur in the C response parser when constructing an error message for a malformed response. This happens in the aiohttp/ http parser.pyx file, where an llhttp error-position pointer is used to create a snippet for malformed request or response bytes at the buffer end, or malformed chunked responses. A server controlled by an attacker, or an accidental response, could trigger a Denial of Service (DoS) in the client.

Recommendations Update to version 3.14.3. As a temporary workaround, use the Python parser by setting AIOHTTP NO EXTENSIONS=1.

Fix

Use After Free

Out of bounds Read

Resource Exhaustion

Weakness Enumeration

CWE-416

CWE-125

CWE-400

Related Identifiers

CVE-2026-69244

GHSA-CQ5V-8Q36-5273

Affected Products

Aiohttp

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-69244 · Security Note
• https://osv.dev/vulnerability/GHSA-cq5v-8q36-5273 · Vendor Advisory
• https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d · Note
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-cq5v-8q36-5273 · Note
• https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3 · Note
• https://github.com/aio-libs/aiohttp/pull/13223 · Note
• https://github.com/aio-libs/aiohttp · Note