UBUNTU-CVE-2025-62727

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Source
https://ubuntu.com/security/CVE-2025-62727
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-62727.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-62727
Upstream
Published
2025-10-28T21:15:00Z
Modified
2026-01-20T19:16:49.443776Z
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. Starting in version 0.39.0 and prior to version 0.49.1 , an unauthenticated attacker can send a crafted HTTP Range header that triggers quadratic-time processing in Starlette's FileResponse Range parsing/merging logic. This enables CPU exhaustion per request, causing denial‑of‑service for endpoints serving files (e.g., StaticFiles or any use of FileResponse). This vulnerability is fixed in 0.49.1.

References

Affected packages

Ubuntu:22.04:LTS / starlette

Package

Name
starlette
Purl
pkg:deb/ubuntu/starlette@0.18.0-1?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/2025/UBUNTU-CVE-2025-62727.json"

Ubuntu:24.04:LTS / starlette

Package

Name
starlette
Purl
pkg:deb/ubuntu/starlette@0.31.1-1?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/2025/UBUNTU-CVE-2025-62727.json"

Ubuntu:25.10 / starlette

Package

Name
starlette
Purl
pkg:deb/ubuntu/starlette@0.46.1-3?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/2025/UBUNTU-CVE-2025-62727.json"