UBUNTU-CVE-2026-26007

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Source
https://ubuntu.com/security/CVE-2026-26007
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26007.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-26007
Upstream
Published
2026-02-13T00:00:00Z
Modified
2026-02-13T18:15:33.912438Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, the publickeyfromnumbers (or EllipticCurvePublicNumbers.publickey()), EllipticCurvePublicNumbers.publickey(), loadderpublickey() and loadpempublickey() functions do not verify that the point belongs to the expected prime-order subgroup of the curve. This missing validation allows an attacker to provide a public key point P from a small-order subgroup. This can lead to security issues in various situations, such as the most commonly used signature verification (ECDSA) and shared key negotiation (ECDH). When the victim computes the shared secret as S = [victimprivatekey]P via ECDH, this leaks information about victimprivatekey mod (smallsubgroup_order). For curves with cofactor > 1, this reveals the least significant bits of the private key. When these weak public keys are used in ECDSA , it's easy to forge signatures on the small subgroup. Only SECT curves are impacted by this. This vulnerability is fixed in 46.0.5.

References

Affected packages

Ubuntu:20.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@2.8-3ubuntu0.3?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.6.1-3.1
2.6.1-4
2.6.1-4ubuntu1
2.8-1ubuntu2
2.8-2
2.8-3
2.8-3ubuntu0.1
2.8-3ubuntu0.2
2.8-3ubuntu0.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.8-3ubuntu0.3",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "2.8-3ubuntu0.3",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26007.json"
Ubuntu:22.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@3.4.8-1ubuntu2.2?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.3.2-1
3.3.2-1build1
3.4.8-1
3.4.8-1ubuntu1
3.4.8-1ubuntu2
3.4.8-1ubuntu2.1
3.4.8-1ubuntu2.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.4.8-1ubuntu2.2",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26007.json"
Ubuntu:24.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@41.0.7-4ubuntu0.1?arch=source&distro=noble

Affected ranges

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

Affected versions

38.*
38.0.4-4
38.0.4-4ubuntu1
41.*
41.0.7-3
41.0.7-4build2
41.0.7-4build3
41.0.7-4ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "41.0.7-4ubuntu0.1",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26007.json"
Ubuntu:25.10
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@43.0.0-1ubuntu1?arch=source&distro=questing

Affected ranges

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

Affected versions

43.*
43.0.0-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "43.0.0-1ubuntu1",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26007.json"
Ubuntu:Pro:16.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@1.2.3-1ubuntu0.3+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

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

Affected versions

1.*
1.0.1-1ubuntu1
1.0.2-1
1.1-1
1.1.1-1
1.1.1-1ubuntu1
1.1.1-1ubuntu2
1.1.1-1ubuntu3
1.2.2-2
1.2.3-1
1.2.3-1ubuntu0.1
1.2.3-1ubuntu0.2
1.2.3-1ubuntu0.3
1.2.3-1ubuntu0.3+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.2.3-1ubuntu0.3+esm1",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "1.2.3-1ubuntu0.3+esm1",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26007.json"
Ubuntu:Pro:18.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@2.1.4-1ubuntu1.4+esm1?arch=source&distro=esm-infra/bionic

Affected ranges

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

Affected versions

1.*
1.9-1
2.*
2.1.3-3
2.1.4-1
2.1.4-1build1
2.1.4-1build2
2.1.4-1ubuntu1
2.1.4-1ubuntu1.1
2.1.4-1ubuntu1.2
2.1.4-1ubuntu1.3
2.1.4-1ubuntu1.4
2.1.4-1ubuntu1.4+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.4-1ubuntu1.4+esm1",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "2.1.4-1ubuntu1.4+esm1",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26007.json"