CVE-2026-54280: aiohttp Remote Code Execution Vulnerability

LOW
Advisory Identifier: GHSA-9x8q-7h8h-wcw9
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CWE-404
Published
Advisory Summary

CVE-2026-54280 is a LOW remote code execution vulnerability (CWE-404: Improper Resource Shutdown or Release) affecting aiohttp libraries in the PyPI ecosystem. The issue involves payload response resources are not closed after mid-body disconnect. Remediation is available by upgrading affected packages to version 3.14.1.

CVE-2026-54280 at a Glance

CVE Identifier CVE-2026-54280
GHSA Identifier GHSA-9x8q-7h8h-wcw9
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-404: Improper Resource Shutdown or Release
Affected Product aiohttp
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2026-54280

To remediate this vulnerability, upgrade all affected aiohttp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

aiohttp fixed: 3.14.1 
pip install aiohttp>=3.14.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show aiohttp

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-54280, inspect your installed packages using pip:

pip show aiohttp

Analyze the terminal output to locate any version of aiohttp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.14.1), your application is affected.

Note: The pip show aiohttp command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-404: Improper Resource Shutdown or Release, where the product does not release or incorrectly releases a resource before it is made available for re-use. In aiohttp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary Payload resources are not closed correctly when a client disconnects in the middle of a write. ### Impact 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. ----- Patch: https://github.com/aio-libs/aiohttp/commit/a762eda5242f6490d6ba667533193f8b473ad587

CVE-2026-54280 Affected aiohttp Versions

1 component(s)
Fixed Versions:
3.14.1
Product / Package Ecosystem Affected Versions Fixed Version
aiohttp
pypi/aiohttp
PyPI
< 3.14.1
3.14.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9x8q-7h8h-wcw9
Security Fix Commit FIX COMMIT
https://github.com/aio-libs/aiohttp/commit/a762eda5242f6490d6ba667533193f8b473ad587
aiohttp Source Repository REPOSITORY
https://github.com/aio-libs/aiohttp

Frequently Asked Questions

What is CVE-2026-54280?
CVE-2026-54280 is a security vulnerability in aiohttp involving Payload Response Resources Are Not Closed After Mid-Body Disconnect under CWE-404: Improper Resource Shutdown or Release.
Which aiohttp versions are affected?
Affected versions include releases prior to 3.14.1 across affected packages: aiohttp.
What version fixes CVE-2026-54280?
Upgrading to 3.14.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is aiohttp affected?
Yes, aiohttp is affected in releases prior to 3.14.1. Upgrade your dependency to 3.14.1 or later.
What CWE is associated with CVE-2026-54280?
CVE-2026-54280 is classified under CWE-404: Improper Resource Shutdown or Release (The product does not release or incorrectly releases a resource before it is made available for re-use.).
How can I check PyPI dependencies for CVE-2026-54280?
Run the dependency tree command: 'pip show aiohttp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9x8q-7h8h-wcw9",
  "modified" : "2026-06-15T20:10:44Z",
  "published" : "2026-06-15T20:10:44Z",
  "aliases" : [ "CVE-2026-54280" ],
  "summary" : "aiohttp: Payload Response Resources Are Not Closed After Mid-Body Disconnect",
  "details" : "### Summary\n\nPayload resources are not closed correctly when a client disconnects in the middle of a write.\n\n### Impact\n\nIf 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.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/a762eda5242f6490d6ba667533193f8b473ad587",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "aiohttp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.14.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.14.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9x8q-7h8h-wcw9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aio-libs/aiohttp/commit/a762eda5242f6490d6ba667533193f8b473ad587"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/aio-libs/aiohttp"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-404" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-15T20:10:44Z",
    "nvd_published_at" : null
  }
}