UBUNTU-CVE-2026-92091

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Source
https://ubuntu.com/security/CVE-2026-92091
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-92091
Upstream
  • CVE-2026-92091
Published
2026-09-17T00:00:00Z
Modified
2026-09-17T13:31:22Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in jwcrypto. The JWK.import_key() function validates the key_ops JWK member for duplicate values using an algorithm with O(n^2) time complexity, and the length of key_ops is not bounded. A remote, unauthenticated attacker can supply a JWK with a large key_ops array to an application that passes attacker-controlled key material to a public key-import API (reachable via ECDH-ES key agreement, OIDC dynamic client registration, DPoP, or ACME account key registration, among others) to consume excessive CPU time, resulting in a denial of service.

References

Affected packages

Ubuntu:16.04:LTS
python-jwcrypto

Package

Name
python-jwcrypto
Purl
pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=xenial

Affected ranges

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

Affected versions

0.*
0.2.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-jwcrypto",
            "binary_version": "0.2.1-1"
        },
        {
            "binary_name": "python3-jwcrypto",
            "binary_version": "0.2.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json"
Ubuntu:18.04:LTS
python-jwcrypto

Package

Name
python-jwcrypto
Purl
pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=bionic

Affected ranges

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

Affected versions

0.*
0.3.2-1
0.4.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-jwcrypto",
            "binary_version": "0.4.2-1"
        },
        {
            "binary_name": "python3-jwcrypto",
            "binary_version": "0.4.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json"
Ubuntu:20.04:LTS
python-jwcrypto

Package

Name
python-jwcrypto
Purl
pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=focal

Affected ranges

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

Affected versions

0.*
0.6.0-1
0.6.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-jwcrypto",
            "binary_version": "0.6.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json"
Ubuntu:22.04:LTS
python-jwcrypto

Package

Name
python-jwcrypto
Purl
pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=jammy

Affected ranges

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

Affected versions

0.*
0.8.0-1
1.*
1.0.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-jwcrypto",
            "binary_version": "1.0.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json"
Ubuntu:24.04:LTS
python-jwcrypto

Package

Name
python-jwcrypto
Purl
pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.1.0-1
1.5.4-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-jwcrypto",
            "binary_version": "1.5.4-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json"
Ubuntu:26.04:LTS
python-jwcrypto

Package

Name
python-jwcrypto
Purl
pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.5.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-jwcrypto",
            "binary_version": "1.5.6-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json"