USN-8335-1

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Source
https://ubuntu.com/security/notices/USN-8335-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8335-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-8335-1
Upstream
Related
Published
2026-05-28T12:47:22Z
Modified
2026-05-28T16:03:04.198985089Z
Summary
pyopenssl vulnerability
Details

It was discovered that pyOpenSSL incorrectly handled exceptions in the tlsext_servername callback. This could result in connections being accepted after an exception, contrary to expectations.

References

Affected packages

Ubuntu:Pro:16.04:LTS / pyopenssl

Package

Name
pyopenssl
Purl
pkg:deb/ubuntu/pyopenssl?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.15.1-2ubuntu0.2+esm1

Affected versions

0.*
0.15.1-2build1
0.15.1-2ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-openssl",
            "binary_version": "0.15.1-2ubuntu0.2+esm1"
        },
        {
            "binary_name": "python3-openssl",
            "binary_version": "0.15.1-2ubuntu0.2+esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-27448",
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8335-1.json"

Ubuntu:Pro:18.04:LTS / pyopenssl

Package

Name
pyopenssl
Purl
pkg:deb/ubuntu/pyopenssl?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
17.5.0-1ubuntu1+esm1

Affected versions

16.*
16.2.0-1
17.*
17.5.0-1
17.5.0-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-openssl",
            "binary_version": "17.5.0-1ubuntu1+esm1"
        },
        {
            "binary_name": "python3-openssl",
            "binary_version": "17.5.0-1ubuntu1+esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-27448",
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8335-1.json"

Ubuntu:Pro:20.04:LTS / pyopenssl

Package

Name
pyopenssl
Purl
pkg:deb/ubuntu/pyopenssl?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
19.0.0-1ubuntu0.1~esm1

Affected versions

19.*
19.0.0-1
19.0.0-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-openssl",
            "binary_version": "19.0.0-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "python3-openssl",
            "binary_version": "19.0.0-1ubuntu0.1~esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-27448",
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8335-1.json"