CVE-2026-22815CWE-400CWE-770

AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers

Medium · published April 1, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
37.2
In the wild
Unconfirmed
What it is

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, insufficient restrictions in header/trailer handling could cause uncapped memory usage. This issue has been patched in version 3.13.4.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00440 · 37.2th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-04-01T20:08Z
EPSS history
Timeline
  • 01 APR 20:08Z
    AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers
    cvelistv5