CVE-2025-69228: Aiohttp Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-6jhg-hg63-jvvf
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CWE-770
Published
Advisory Summary

CVE-2025-69228 is a MODERATE denial of service vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Aiohttp libraries in the PyPI ecosystem. The issue involves aiohttp vulnerable to denial of service through large payloads. Remediation is available by upgrading affected packages to version 3.13.3.

CVE-2025-69228 at a Glance

CVE Identifier CVE-2025-69228
GHSA Identifier GHSA-6jhg-hg63-jvvf
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Aiohttp
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2025-69228

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: 3.13.3 
pip install aiohttp>=3.13.3
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-2025-69228, 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 3.13.3), 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. 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 A request can be crafted in such a way that an aiohttp server's memory fills up uncontrollably during processing. ### Impact If an application includes a handler that uses the `Request.post()` method, an attacker may be able to freeze the server by exhausting the memory. ----- Patch: https://github.com/aio-libs/aiohttp/commit/b7dbd35375aedbcd712cbae8ad513d56d11cce60

CVE-2025-69228 Affected Aiohttp Versions

1 component(s)
Fixed Versions:
3.13.3
Product / Package Ecosystem Affected Versions Fixed Version
aiohttp
pypi/aiohttp
PyPI
< 3.13.3
3.13.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-6jhg-hg63-jvvf
NVD — CVE-2025-69228 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-69228
Security Fix Commit FIX COMMIT
https://github.com/aio-libs/aiohttp/commit/b7dbd35375aedbcd712cbae8ad513d56d11cce60
Aiohttp Source Repository REPOSITORY
https://github.com/aio-libs/aiohttp

Frequently Asked Questions

What is CVE-2025-69228?
CVE-2025-69228 is a security vulnerability in Aiohttp involving AIOHTTP vulnerable to denial of service through large payloads under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Aiohttp versions are affected?
Affected versions include releases prior to 3.13.3 across affected packages: aiohttp.
What version fixes CVE-2025-69228?
Upgrading to 3.13.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is aiohttp affected?
Yes, aiohttp is affected in releases prior to 3.13.3. Upgrade your dependency to 3.13.3 or later.
What CWE is associated with CVE-2025-69228?
CVE-2025-69228 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check PyPI dependencies for CVE-2025-69228?
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-6jhg-hg63-jvvf",
  "modified" : "2026-01-06T16:06:55Z",
  "published" : "2026-01-05T23:13:14Z",
  "aliases" : [ "CVE-2025-69228" ],
  "summary" : "AIOHTTP vulnerable to  denial of service through large payloads",
  "details" : "### Summary\nA request can be crafted in such a way that an aiohttp server's memory fills up uncontrollably during processing.\n\n### Impact\nIf an application includes a handler that uses the `Request.post()` method, an attacker may be able to freeze the server by exhausting the memory.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/b7dbd35375aedbcd712cbae8ad513d56d11cce60",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "aiohttp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.13.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.13.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-6jhg-hg63-jvvf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-69228"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aio-libs/aiohttp/commit/b7dbd35375aedbcd712cbae8ad513d56d11cce60"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/aio-libs/aiohttp"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-05T23:13:14Z",
    "nvd_published_at" : "2026-01-06T00:15:48Z"
  }
}