UBUNTU-CVE-2026-48802

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Source
https://ubuntu.com/security/CVE-2026-48802
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48802.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48802
Upstream
Published
2026-08-13T00:00:00Z
Modified
2026-08-13T19:30:19.915147375Z
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. Prior to version 4.13.2, an attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection is received, and when the client sends a PONG packet. This issue primarily affects synchronous servers. Asynchronous servers allocate background tasks instead of physical threads, which are lightweight and less likely to cause denial of service. However, the fix that was implemented was also applied to the asynchronous case. Version 4.13.2 addresses this issue as follows: The initial background thread (or async task( for heartbeat management is only launched if a client passes authentication in the connect handler; and the server now ensures that there is only one background heatbeat thread (or async task) per client at a given point in time. Out of sequence PONG packets are now discarded when an active heartbeat thread is already running.

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_name": "python3-engineio",
            "binary_version": "1.6.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48802.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_name": "python3-engineio",
            "binary_version": "3.11.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48802.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_name": "python3-engineio",
            "binary_version": "4.0.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48802.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_name": "python3-engineio",
            "binary_version": "4.3.4-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48802.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_name": "python3-engineio",
            "binary_version": "4.13.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48802.json"