UBUNTU-CVE-2026-54283

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Source
https://ubuntu.com/security/CVE-2026-54283
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54283.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54283
Upstream
  • CVE-2026-54283
Published
2026-06-22T18:16:00Z
Modified
2026-06-24T11:01:57.865119488Z
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

Starlette is a lightweight ASGI framework/toolkit. From 0.4.1 until 1.3.1, request.form() accepts maxfields and maxpart_size to bound resource consumption while parsing form data. These limits are enforced for multipart/form-data, but silently ignored for application/x-www-form-urlencoded. An unauthenticated attacker can therefore send a urlencoded body with an arbitrarily large number of fields or an arbitrarily large field, even when the application configured limits it believed would apply. This vulnerability is fixed in 1.3.1.

References

Affected packages

Ubuntu:22.04:LTS / starlette

Package

Name
starlette
Purl
pkg:deb/ubuntu/starlette?arch=source&distro=jammy

Affected ranges

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

Affected versions

0.*
0.14.1-1
0.16.0-1
0.18.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-starlette",
            "binary_version": "0.18.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54283.json"

Ubuntu:24.04:LTS / starlette

Package

Name
starlette
Purl
pkg:deb/ubuntu/starlette?arch=source&distro=noble

Affected ranges

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

Affected versions

0.*
0.30.0-1
0.31.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-starlette",
            "binary_version": "0.31.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54283.json"

Ubuntu:25.10 / starlette

Package

Name
starlette
Purl
pkg:deb/ubuntu/starlette?arch=source&distro=questing

Affected ranges

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

Affected versions

0.*
0.46.1-2
0.46.1-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-starlette",
            "binary_version": "0.46.1-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54283.json"

Ubuntu:26.04:LTS / starlette

Package

Name
starlette
Purl
pkg:deb/ubuntu/starlette?arch=source&distro=resolute

Affected ranges

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

Affected versions

0.*
0.46.1-3
0.50.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.50.0-1",
            "binary_name": "python3-starlette"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54283.json"