---
id: CVE-2026-54280
title: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
summary: >-
  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…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-404
  - CWE-772
vendor: aiohttp
product: aiohttp
affected:
  - 'aiohttp >= 3.12.1, < 3.14.1'
patched:
  - aiohttp 3.14.1
published: '2026-06-22'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:15:00.917'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54280'
references:
  - url: >-
      https://github.com/aio-libs/aiohttp/commit/a762eda5242f6490d6ba667533193f8b473ad587
    label: security-advisories@github.com
  - url: >-
      https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9x8q-7h8h-wcw9
    label: security-advisories@github.com
  - url: 'https://github.com/aio-libs/aiohttp'
  - url: 'https://github.com/advisories/GHSA-9x8q-7h8h-wcw9'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54280.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-54280'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2491471'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-54280'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54280'
tags:
  - nvd
  - osv
  - pip
  - ghsa
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.0046
epssPercentile: 0.37299
aliases:
  - GHSA-9x8q-7h8h-wcw9
  - PYSEC-2026-2113
ecosystem: pip
ingestedAt: '2026-07-07T15:41:58.683Z'
scores:
  nvd: 7.5
  vendor: 3.7
---

## Overview

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

- `aiohttp >= 3.12.1, < 3.14.1`

## Remediation

Upgrade past the affected range:

- `aiohttp 3.14.1`

## Package advisory (CVE-2026-54280)

Affected packages:

- `aiohttp < 3.14.1`

Patched in:

- `aiohttp 3.14.1`

Source: https://osv.dev/vulnerability/GHSA-9x8q-7h8h-wcw9

## Vendor advisories

- **Red Hat VEX** · Low · affected: Migration Toolkit for Applications 8, OpenShift Lightspeed · no fix planned: Migration Toolkit for Applications 8, OpenShift Lightspeed · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54280.json)