CVE-2026-34516

MEDIUM EPSS 35.2%
Published Apr 1, 20263mo ago · Modified Jun 17, 20262w ago
6.6 CVSS 4.0
Medium
Find Similar
Published Apr 1, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
6.6
Exploitability
—
Impact
—
Vector string
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

Threat Intelligence

EPSS Exploit Probability
35.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-770

Affected Products 1

VendorProductVersionRange
aiohttpaiohttp* <3.13.4

References 3

  • github.com https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f
    Patch
  • github.com https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
    Release Notes
  • github.com https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647
    PatchVendor Advisory

Remediation

  • github.com https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f
    Patch
  • github.com https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647
    PatchVendor Advisory