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Python CVE-2026-34516

| EUVDEUVD-2026-18040 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-04-01 GitHub_M GHSA-m5qp-6w8w-w647
Python Denial Of Service Red Hat Suse
6.6
CVSS 4.0 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
6.6 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.3 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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
None
Scope
X

Lifecycle Timeline

4
Patch released
Apr 02, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 01, 2026 - 21:00 euvd
EUVD-2026-18040
Analysis Generated
Apr 01, 2026 - 21:00 vuln.today
CVE Published
Apr 01, 2026 - 20:13 nvd
MEDIUM 6.6

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 122 pypi packages depend on aiohttp (43 direct, 79 indirect)

Ecosystem-wide dependent count for version 3.13.4.

DescriptionGitHub Advisory

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, a response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability. This issue has been patched in version 3.13.4.

AnalysisAI

Memory exhaustion vulnerability in AIOHTTP prior to version 3.13.4 allows unauthenticated remote attackers to trigger denial of service via specially crafted HTTP responses containing excessive multipart headers. The vulnerability exploits insufficient memory limits during multipart header parsing, causing the server or client to consume more memory than intended. CVSS 6.6 (medium-high availability impact) with no public exploit code identified at time of analysis.

Technical ContextAI

AIOHTTP is an asyncio-based HTTP framework for Python that handles both client and server operations. The vulnerability resides in the multipart header parsing logic (CWE-770: Allocation of Resources Without Limits or Throttling), where the framework fails to enforce adequate memory constraints when processing HTTP multipart responses. An attacker can construct a response with an abnormally high number of multipart headers, causing unbounded memory allocation during parsing. The CPE cpe:2.3:a:aio-libs:aiohttp:*:*:*:*:*:*:*:* indicates all versions prior to the patch are affected. This is a resource exhaustion vulnerability rather than code execution or authentication bypass, making it a classic denial-of-service attack vector against applications using vulnerable AIOHTTP versions.

RemediationAI

Vendor-released patch: upgrade AIOHTTP to version 3.13.4 or later. The patch is available at https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4. For Python package management, use pip install --upgrade aiohttp>=3.13.4 to obtain the fixed version. The upstream fix details are available in the commit at https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f. Until patching is possible, applications should implement external rate limiting or request size restrictions at the network layer (e.g., reverse proxy configuration) to reject HTTP requests with abnormally high header counts, though this is less reliable than the vendor patch.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Public Cloud 15 SP7 Fixed
SUSE Linux Enterprise Module for Python 3 15 SP7 Fixed

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CVE-2026-34516 vulnerability details – vuln.today
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