UBUNTU-CVE-2025-61920

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Source
https://ubuntu.com/security/CVE-2025-61920
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-61920.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-61920
Upstream
Published
2025-10-10T20:15:00Z
Modified
2025-10-16T08:02:49.230129Z
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

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url‑encoded header or signature spans hundreds of megabytes. During verification, Authlib decodes and parses the full input before it is rejected, driving CPU and memory consumption to hostile levels and enabling denial of service. Version 1.6.5 patches the issue. Some temporary workarounds are available. Enforce input size limits before handing tokens to Authlib and/or use application-level throttling to reduce amplification risk.

References

Affected packages

Ubuntu:22.04:LTS / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/ubuntu/python-authlib@0.15.5-1?arch=source&distro=jammy

Affected ranges

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

Affected versions

0.*

0.15.4-1
0.15.5-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.15.5-1",
            "binary_name": "python3-authlib"
        }
    ]
}

Ubuntu:24.04:LTS / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/ubuntu/python-authlib@1.3.0-1?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*

1.2.1-1
1.3.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.3.0-1",
            "binary_name": "python3-authlib"
        }
    ]
}

Ubuntu:25.10 / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/ubuntu/python-authlib@1.6.0-1?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*

1.5.1-1
1.5.2-1
1.6.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.6.0-1",
            "binary_name": "python3-authlib"
        }
    ]
}

Ubuntu:25.04 / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/ubuntu/python-authlib@1.5.1-1?arch=source&distro=plucky

Affected ranges

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

Affected versions

1.*

1.3.2-1
1.3.2-2
1.4.0-1
1.4.1-1
1.5.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.5.1-1",
            "binary_name": "python3-authlib"
        }
    ]
}