UBUNTU-CVE-2026-48809

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Source
https://ubuntu.com/security/CVE-2026-48809
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48809.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48809
Upstream
Published
2026-08-13T00:00:00Z
Modified
2026-08-13T19:30:18.498807806Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take advantage of these to cause unnecessary memory allocations in the python-engineio server. The two cases are POST requests, when using ASGI with the long polling transport and WebSocket messages, when using Aiohttp with the WebSocket transport. Version 4.13.2 addresses this issue. ASGI severs now only load the body of incoming requests into memory after the client is confirmed to be known and authenticated, and the payload size is below the maximum allowed size. Requests that do not comply with these requirements are discarded. Aiohttp servers configure the maximum payload size in the underlying WebSocket layer from Aiohttp, so that large messages are discarded by Aiohttp before they are delivered to python-engineio.

References

Affected packages

Ubuntu:18.04:LTS / python-engineio

Package

Name
python-engineio
Purl
pkg:deb/ubuntu/python-engineio?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.6.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.6.1-1",
            "binary_name": "python3-engineio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48809.json"

Ubuntu:20.04:LTS / python-engineio

Package

Name
python-engineio
Purl
pkg:deb/ubuntu/python-engineio?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.0+dfsg-1
3.11.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.11.1-1",
            "binary_name": "python3-engineio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48809.json"

Ubuntu:22.04:LTS / python-engineio

Package

Name
python-engineio
Purl
pkg:deb/ubuntu/python-engineio?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.0.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.0.0-1",
            "binary_name": "python3-engineio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48809.json"

Ubuntu:24.04:LTS / python-engineio

Package

Name
python-engineio
Purl
pkg:deb/ubuntu/python-engineio?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.3.4-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.3.4-2",
            "binary_name": "python3-engineio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48809.json"

Ubuntu:26.04:LTS / python-engineio

Package

Name
python-engineio
Purl
pkg:deb/ubuntu/python-engineio?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.12.1-2
4.13.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.13.0-2",
            "binary_name": "python3-engineio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48809.json"