Vulnerability · Published Oct 19, 2026 · Assigned by GitHub_M

CVE-2026-111066AIOHTTP: File descriptor exhaustion in multipart requests

High 8.2

In plain English

A high-severity uncontrolled resource consumption 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 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.4%top 64.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. From 2.0.0 until 3.14.4, multipart request processing can retain an unbounded number of open file descriptors. An unauthenticated attacker can consequently exhaust file descriptors with specially crafted multipart requests when a handler uses Request.post(). This issue is fixed in version 3.14.4.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	python-aiohttp	no fix listed	DEBIAN-CVE-2026-111066
Debian:13	python-aiohttp	no fix listed	DEBIAN-CVE-2026-111066
Debian:14	python-aiohttp	no fix listed	DEBIAN-CVE-2026-111066
PyPI	aiohttp	3.14.4	GHSA-9xw5-w5jj-pvcg
Ubuntu:26.10	python-aiohttp	no fix listed	UBUNTU-CVE-2026-111066

Affected products (as reported)

Vendor	Product	Versions
aio-libs	aiohttp	>= 2.0.0, < 3.14.4

Weakness: CWE-400, CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9xw5-w5jj-pvcg x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/2d94633b7f1b4c1ba07d647b629a8440652b2d09 x_refsource_MISC
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4 x_refsource_MISC