Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M
CVE-2026-54280AIOHTTP: Payload Response Resources Are Not Closed After Mid-Body Disconnect
Low 1.7
In plain English
A low-severity security flaw 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 40% 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, payload resources are not closed correctly when a client disconnects in the middle of a write. If a payload is using an open file or similar limited resource, then an attacker may be able to cause resource starvation temporarily until garbage collection or similar closes the file. This vulnerability is fixed in 3.14.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | python-aiohttp | 3.8.4-1+deb12u2 | DEBIAN-CVE-2026-54280 |
| Debian:13 | python-aiohttp | no fix listed | DEBIAN-CVE-2026-54280 |
| Debian:14 | python-aiohttp | 3.14.1-1 | DEBIAN-CVE-2026-54280 |
| PyPI | aiohttp | 3.14.1 | PYSEC-2026-2113 |
| PyPI | aiohttp | 3.14.1 | GHSA-9x8q-7h8h-wcw9 |
| Ubuntu:25.10 | python-aiohttp | no fix listed | UBUNTU-CVE-2026-54280 |
| Ubuntu:26.10 | python-aiohttp | no fix listed | UBUNTU-CVE-2026-54280 |
Affected products (as reported)
Weakness: CWE-404 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U