USN-8087-3

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Source
https://ubuntu.com/security/notices/USN-8087-3
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8087-3.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8087-3
Upstream
Related
Published
2026-04-28T11:04:02Z
Modified
2026-04-30T10:00:02.565721100Z
Summary
python-cryptography vulnerability
Details

USN-8087-1 fixed a vulnerability in python-cryptography. This update provides the corresponding update to Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that python-cryptography incorrectly handled subgroup validation for SECT curves. A remote attacker could use this issue to perform a subgroup attack and possibly recover the least significant bits of private keys.

References

Affected packages

Ubuntu:Pro:16.04:LTS / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@1.2.3-1ubuntu0.3+esm3?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.2.3-1ubuntu0.3+esm3

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 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python-cryptography",
            "binary_version": "1.2.3-1ubuntu0.3+esm3"
        },
        {
            "binary_name": "python3-cryptography",
            "binary_version": "1.2.3-1ubuntu0.3+esm3"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-26007"
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8087-3.json"

Ubuntu:Pro:18.04:LTS / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@2.1.4-1ubuntu1.4+esm3?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.1.4-1ubuntu1.4+esm3

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 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python-cryptography",
            "binary_version": "2.1.4-1ubuntu1.4+esm3"
        },
        {
            "binary_name": "python3-cryptography",
            "binary_version": "2.1.4-1ubuntu1.4+esm3"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-26007"
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8087-3.json"

Ubuntu:Pro:20.04:LTS / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@2.8-3ubuntu0.3+esm2?arch=source&distro=esm-infra/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.8-3ubuntu0.3+esm2

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 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python-cryptography",
            "binary_version": "2.8-3ubuntu0.3+esm2"
        },
        {
            "binary_version": "2.8-3ubuntu0.3+esm2",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-26007"
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8087-3.json"