Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M
CVE-2026-54273AIOHTTP: HTTP/1 Pipelined Requests Queue Without Limit
Medium 6.6
In plain English
A medium-severity resource allocation without limits in aiohttp from aio-libs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to use excessive amounts of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | python-aiohttp | no fix listed | DEBIAN-CVE-2026-54273 |
| Debian:13 | python-aiohttp | no fix listed | DEBIAN-CVE-2026-54273 |
| Debian:14 | python-aiohttp | 3.14.1-1 | DEBIAN-CVE-2026-54273 |
| PyPI | aiohttp | 3.14.1 | PYSEC-2026-2107 |
| PyPI | aiohttp | 3.14.1 | GHSA-4fvr-rgm6-gqmc |
| Ubuntu:25.10 | python-aiohttp | no fix listed | UBUNTU-CVE-2026-54273 |
| Ubuntu:26.10 | python-aiohttp | no fix listed | UBUNTU-CVE-2026-54273 |
Affected products (as reported)
Weakness: CWE-770 · Vector: 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