AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response) (CVE-2026-69244) | HOL Guard CVE

High · CVSS 7.1CVE-2026-69244GHSA-CQ5V-8Q36-5273

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

Answer in brief

CVE-2026-69244 records a High severity (CVSS 7.1) vulnerability in AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response). The current sources do not mark it as known exploited. The current feed maps aiohttp (pip), aiohttp (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 3, 2026Updated Sep 10, 2026Source checked Sep 18, 2026First seen by HOL Aug 3, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps aiohttp (pip), aiohttp (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
aiohttppip	<=3.14.2	3.14.3
aiohttppypi	>=0 <3.14.3	3.14.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for aiohttp, aiohttp.
Review the reported fix. Update aiohttp to 3.14.3; aiohttp to 3.14.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 3, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Aug 3, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.