UBUNTU-CVE-2026-126347

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Source
https://ubuntu.com/security/CVE-2026-126347
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-126347
Upstream
Published
2026-11-13T00:00:00Z
Modified
2026-11-13T21:05:25Z
Severity
  • 3.1 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Tornado is a Python web framework and asynchronous networking library. In versions through 6.6.0, applications using  tornado.web.RedirectHandler with URL templates that allow attacker-controlled substitutions to influence the destination can be vulnerable to an open redirect using three or more leading slashes. Differences between Python’s URL parsing and browser URL interpretation allow a crafted destination to redirect a user to an attacker-controlled host. The remediation for CVE-2026-116578 in version 6.6.0 did not fully address this case. This issue is fixed in version 6.6.1.

References

Affected packages

Ubuntu:24.04:LTS
python-tornado

Package

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

Affected ranges

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

Affected versions

6.*
6.3.2-1
6.4.0-0ubuntu1
6.4.0-1
6.4.0-1build1
6.4.0-1ubuntu0.1
6.4.0-1ubuntu0.2
6.4.0-1ubuntu0.4
6.4.0-1ubuntu0.5
6.4.0-1ubuntu0.6
6.4.0-1ubuntu0.7
6.4.0-1ubuntu0.8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-tornado",
            "binary_version": "6.4.0-1ubuntu0.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json"
Ubuntu:26.04:LTS
python-tornado

Package

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

Affected ranges

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

Affected versions

6.*
6.4.2-3
6.5.2-3
6.5.4-0.1
6.5.4-0.1ubuntu0.1
6.5.4-0.1ubuntu0.2
6.5.4-0.1ubuntu0.3
6.5.4-0.1ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-tornado",
            "binary_version": "6.5.4-0.1ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json"
Ubuntu:26.10
python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado?arch=source&distro=stonking

Affected ranges

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

Affected versions

6.*
6.5.4-0.1
6.5.5-2
6.5.5-4
6.5.5-5
6.5.5-5ubuntu1.1
6.5.5-5ubuntu1.2
6.5.5-5ubuntu1.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-tornado",
            "binary_version": "6.5.5-5ubuntu1.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json"
Ubuntu:Pro:16.04:LTS
python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

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

Affected versions

4.*
4.2.1-1ubuntu2
4.2.1-1ubuntu3
4.2.1-1ubuntu3.1
4.2.1-1ubuntu3.1+esm1
4.2.1-1ubuntu3.1+esm2
4.2.1-1ubuntu3.1+esm3
4.2.1-1ubuntu3.1+esm4
4.2.1-1ubuntu3.1+esm5
4.2.1-1ubuntu3.1+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-tornado",
            "binary_version": "4.2.1-1ubuntu3.1+esm6"
        },
        {
            "binary_name": "python3-tornado",
            "binary_version": "4.2.1-1ubuntu3.1+esm6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json"
Ubuntu:Pro:18.04:LTS
python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

4.*
4.5.1-2.1~build2
4.5.2-1
4.5.3-1
4.5.3-1ubuntu0.1
4.5.3-1ubuntu0.2
4.5.3-1ubuntu0.2+esm1
4.5.3-1ubuntu0.2+esm2
4.5.3-1ubuntu0.2+esm3
4.5.3-1ubuntu0.2+esm4
4.5.3-1ubuntu0.2+esm5
4.5.3-1ubuntu0.2+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-tornado",
            "binary_version": "4.5.3-1ubuntu0.2+esm6"
        },
        {
            "binary_name": "python3-tornado",
            "binary_version": "4.5.3-1ubuntu0.2+esm6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json"
Ubuntu:Pro:20.04:LTS
python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

5.*
5.1.1-4ubuntu1
5.1.1-4ubuntu5
6.*
6.0.3+really5.1.1-2
6.0.3+really5.1.1-2build1
6.0.3+really5.1.1-2build2
6.0.3+really5.1.1-3
6.0.3+really5.1.1-3ubuntu0.1~esm1
6.0.3+really5.1.1-3ubuntu0.1~esm3
6.0.3+really5.1.1-3ubuntu0.1~esm5
6.0.3+really5.1.1-3ubuntu0.1~esm7
6.0.3+really5.1.1-3ubuntu0.1~esm8
6.0.3+really5.1.1-3ubuntu0.1~esm9

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-tornado",
            "binary_version": "6.0.3+really5.1.1-3ubuntu0.1~esm9"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json"
Ubuntu:Pro:22.04:LTS
python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

6.*
6.1.0-1build1
6.1.0-2
6.1.0-3
6.1.0-3build1
6.1.0-3ubuntu0.1~esm1
6.1.0-3ubuntu0.1~esm2
6.1.0-3ubuntu0.1~esm4
6.1.0-3ubuntu0.1~esm5
6.1.0-3ubuntu0.1~esm6
6.1.0-3ubuntu0.1~esm7
6.1.0-3ubuntu0.1~esm8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-tornado",
            "binary_version": "6.1.0-3ubuntu0.1~esm8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126347.json"