UBUNTU-CVE-2026-27448

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Source
https://ubuntu.com/security/CVE-2026-27448
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27448.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-27448
Upstream
Downstream
Related
Published
2026-03-18T00:00:00Z
Modified
2026-05-28T15:59:11.323429220Z
Severity
  • 1.7 (Low) CVSS_V4 - 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 CVSS Calculator
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.

References

Affected packages

Ubuntu:22.04:LTS
pyopenssl

Package

Name
pyopenssl
Purl
pkg:deb/ubuntu/pyopenssl?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
21.0.0-1ubuntu0.1

Affected versions

20.*
20.0.1-1
21.*
21.0.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-openssl",
            "binary_version": "21.0.0-1ubuntu0.1"
        }
    ],
    "priority_reason": "This has been rated low severity by pyOpenSSL developers"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27448.json"
Ubuntu:24.04:LTS
pyopenssl

Package

Name
pyopenssl
Purl
pkg:deb/ubuntu/pyopenssl?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
23.2.0-1ubuntu0.1

Affected versions

23.*
23.0.0-1
23.2.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-openssl",
            "binary_version": "23.2.0-1ubuntu0.1"
        }
    ],
    "priority_reason": "This has been rated low severity by pyOpenSSL developers"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27448.json"
Ubuntu:25.10
pyopenssl

Package

Name
pyopenssl
Purl
pkg:deb/ubuntu/pyopenssl?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
25.0.0-1ubuntu0.1

Affected versions

25.*
25.0.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-openssl",
            "binary_version": "25.0.0-1ubuntu0.1"
        }
    ],
    "priority_reason": "This has been rated low severity by pyOpenSSL developers"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27448.json"
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 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "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"
        }
    ],
    "priority_reason": "This has been rated low severity by pyOpenSSL developers"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27448.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 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python-openssl",
            "binary_version": "17.5.0-1ubuntu1+esm1"
        },
        {
            "binary_name": "python3-openssl",
            "binary_version": "17.5.0-1ubuntu1+esm1"
        }
    ],
    "priority_reason": "This has been rated low severity by pyOpenSSL developers"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27448.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 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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"
        }
    ],
    "priority_reason": "This has been rated low severity by pyOpenSSL developers"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27448.json"