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aiohttp EUVDEUVD-2026-52438

| CVE-2026-69244 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-08-03 GitHub_M GHSA-cq5v-8q36-5273
Denial Of Service Python Aiohttp Aio Libs
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

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
  • 245 pypi packages depend on aiohttp (108 direct, 144 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. No public exploit code has been identified at time of analysis, and this vulnerability is not listed in CISA KEV.

Technical ContextAI

aiohttp is a widely-used Python asyncio HTTP client/server library (CPE: cpe:2.3:a:aio-libs:aiohttp:*:*:*:*:*:*:*:*) that ships an optional compiled Cython extension (_http_parser.pyx) wrapping the llhttp HTTP parsing library for performance. The vulnerable code path is in the error-reporting branch of the C parser: when llhttp reports a parse error, the old code retrieved the error position via cparser.llhttp_get_error_pos() which returns a raw C pointer, then called .split(b'\r\n', 1)[0] directly on that pointer value. Because the pointer is not bounded to the Python data bytes object, this performs an unbounded read past the end of the allocated buffer - a heap out-of-bounds read classified as CWE-400 (Uncontrolled Resource Consumption). The fix in PR #13223 computes error_off = error_pos - base to derive a safe integer offset and slices data[error_off:] instead, keeping all reads inside the known buffer. The Python fallback parser does not use llhttp pointer arithmetic and is entirely unaffected.

RemediationAI

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. If an immediate upgrade is not feasible, set the environment variable AIOHTTP_NO_EXTENSIONS=1 before starting the application to force use of the unaffected Python parser - note this workaround disables the C extension and will reduce HTTP parsing throughput for high-volume applications. The underlying fix and full advisory are documented at https://github.com/aio-libs/aiohttp/security/advisories/GHSA-cq5v-8q36-5273 and patch commit https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d.

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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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EUVD-2026-52438 vulnerability details – vuln.today
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