UBUNTU-CVE-2026-103263

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Source
https://ubuntu.com/security/CVE-2026-103263
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103263.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-103263
Upstream
Downstream
Related
Published
2026-10-01T11:17:00Z
Modified
2026-10-22T23:19:38Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside the static root without confirming the resolved target stays within it. When a symlink pointing outside the static directory exists inside it, unauthenticated attackers can request it to read files such as configuration files, private keys, and application secrets accessible to the process user.

References

Affected packages

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
Fixed
4.2.1-1ubuntu3.1+esm4

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

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "python-tornado",
            "binary_version":  "4.2.1-1ubuntu3.1+esm4"
        },
        {
            "binary_name":  "python3-tornado",
            "binary_version":  "4.2.1-1ubuntu3.1+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103263.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
Fixed
4.5.3-1ubuntu0.2+esm4

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

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "python-tornado",
            "binary_version":  "4.5.3-1ubuntu0.2+esm4"
        },
        {
            "binary_name":  "python3-tornado",
            "binary_version":  "4.5.3-1ubuntu0.2+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103263.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
Fixed
6.1.0-3ubuntu0.1~esm6

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

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "python3-tornado",
            "binary_version":  "6.1.0-3ubuntu0.1~esm6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103263.json"

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
Fixed
6.4.0-1ubuntu0.6

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

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "python3-tornado",
            "binary_version":  "6.4.0-1ubuntu0.6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103263.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
Fixed
6.5.4-0.1ubuntu0.2

Affected versions

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

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "python3-tornado",
            "binary_version":  "6.5.4-0.1ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103263.json"