UBUNTU-CVE-2026-48818

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Source
https://ubuntu.com/security/CVE-2026-48818
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48818.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48818
Upstream
Published
2026-06-17T19:18:00Z
Modified
2026-06-30T18:18:17.490967966Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and earlier, StaticFiles on Windows is vulnerable to SSRF. An UNC path such as \attacker.com\share can cause os.path.realpath to initiate an outbound SMB connection before the path is rejected, exposing the service account’s NTLMv2 credentials for offline cracking or relay even though the HTTP response is only a 404. The issue affects default followsymlink=False deployments, including frameworks built on Starlette such as FastAPI; POSIX systems and followsymlink=True are unaffected. The issue is fixed in 1.1.0.

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_version": "0.18.0-1",
            "binary_name": "python3-starlette"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48818.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_version": "0.31.1-1",
            "binary_name": "python3-starlette"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48818.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_version": "0.46.1-3",
            "binary_name": "python3-starlette"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48818.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-2026-48818.json"