UBUNTU-CVE-2026-64847

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Source
https://ubuntu.com/security/CVE-2026-64847
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64847.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-64847
Upstream
Published
2026-09-18T18:17:00Z
Modified
2026-09-23T23:32:57Z
Severity
  • 6.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.

References

Affected packages

Ubuntu:22.04:LTS / python-anyio

Package

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

Affected ranges

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

Affected versions

2.*
2.0.2-2
3.*
3.5.0-2ubuntu1
3.5.0-3ubuntu2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-anyio",
            "binary_version":  "3.5.0-3ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64847.json"

Ubuntu:24.04:LTS / python-anyio

Package

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

Affected ranges

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

Affected versions

3.*
3.7.0-1
4.*
4.2.0-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-anyio",
            "binary_version":  "4.2.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64847.json"

Ubuntu:26.04:LTS / python-anyio

Package

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

Affected ranges

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

Affected versions

4.*
4.8.0-3
4.11.0-2
4.11.0-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-anyio",
            "binary_version":  "4.11.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64847.json"