UBUNTU-CVE-2026-116577

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Source
https://ubuntu.com/security/CVE-2026-116577
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116577.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-116577
Upstream
Published
2026-10-26T21:18:00Z
Modified
2026-10-28T20:15:58Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Tornado is a Python web framework and asynchronous networking library. Prior to 6.6, Tornado's HTTP header parser accepts obsolete line folding and repeatedly concatenates short continuation lines, causing quadratic CPU consumption on the IOLoop thread. An unauthenticated client can submit a header block containing many obsolete line-folding continuations before application code runs, blocking other connections served by the process. The cost grows with max_header_size, and only availability is affected. This issue is fixed in version 6.6.

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

Ecosystem specific 

{
    "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-2026-116577.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

Ecosystem specific 

{
    "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-2026-116577.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

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-tornado",
            "binary_version":  "6.5.5-5ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116577.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

Ecosystem specific 

{
    "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-2026-116577.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

Ecosystem specific 

{
    "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-2026-116577.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

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-tornado",
            "binary_version":  "6.0.3+really5.1.1-3ubuntu0.1~esm7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116577.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

Ecosystem specific 

{
    "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-2026-116577.json"