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aiohttp CVE-2026-69244

| EUVDEUVD-2026-52438 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-08-03 GitHub_M GHSA-cq5v-8q36-5273
Python Denial Of Service Aiohttp Suse Red Hat
7.1
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.1 HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

Client must actively connect to attacker server (UI:R); impact is availability-only via crash, with no confidentiality or integrity exposure.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

4
Patch available
Aug 03, 2026 - 22:17 EUVD
Source Code Evidence Fetched
Aug 03, 2026 - 21:36 vuln.today
Analysis Generated
Aug 03, 2026 - 21:36 vuln.today
CVE Published
Aug 03, 2026 - 20:50 cve.org
HIGH 7.1

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 44,804 pypi packages depend on aiohttp (15,289 direct, 30,337 indirect)

Ecosystem-wide dependent count for version 3.14.3.

DescriptionCVE.org

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.

Articles & Coverage 2

News 3 New Python Vulnerabilities - 3 High Severity, 3 With POC Aug 04, 2026 News 3 New Python Vulnerabilities - 3 High Severity, 1 With POC Aug 03, 2026

AnalysisAI

Out-of-bounds heap read in aiohttp's C HTTP response parser (versions ≤ 3.14.2) allows an attacker-controlled server to crash the client application via a malformed chunked HTTP response, causing denial of service. The flaw exists only when the compiled C extension is active - the default installation mode - and is triggered during error-message construction in aiohttp/_http_parser.pyx when the llhttp error-position pointer is materialized as a raw pointer rather than a bounded offset into the Python bytes buffer. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Client initiates HTTP request to attacker server
Delivery
Server returns malformed chunked response body
Exploit
llhttp reports parse error, error handler invoked
Install
C parser dereferences raw llhttp error-position pointer
C2
Out-of-bounds heap read past buffer end
Execute
Client process crashes
Impact
Denial of service
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Vulnerability AssessmentAI

Exploitation The C extension parser must be compiled and active, which is the default for standard pip installations of aiohttp; applications running with AIOHTTP_NO_EXTENSIONS=1 are fully immune. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 7.1 (AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N) accurately captures the threat model: this is a network-reachable, low-complexity availability-only impact, but UI:P (passive user interaction) is the critical constraint - the aiohttp client must initiate a connection to the attacker-controlled server. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker operates a malicious HTTP server and lures or redirects an aiohttp client application (≤ 3.14.2, C extensions enabled) into making an HTTP request to it. The server returns a malformed chunked HTTP response - for example, a chunk size line ending with \r followed by a non-LF byte - which triggers llhttp's error handler; the C parser then reads past the end of the input buffer while constructing the diagnostic error message, crashing the client process. …
Remediation Upgrade aiohttp to version 3.14.3 or later via pip install --upgrade aiohttp; the patched release is confirmed at https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, conduct inventory of all aiohttp installations (versions ≤3.14.2) across development, staging, and production environments, prioritizing customer-facing and critical services. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Public Cloud 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Python 3 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-69244 vulnerability details – vuln.today
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