UBUNTU-CVE-2026-14957

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Source
https://ubuntu.com/security/CVE-2026-14957
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14957.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-14957
Upstream
  • CVE-2026-14957
Published
2026-09-02T03:16:00Z
Modified
2026-09-16T14:01:35Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

In FIPS mode, Libreswan's add_decoded_cert() function calls CERT_ExtractPublicKey() and asserts that the result is not NULL. However, CERT_ExtractPublicKey() returns NULL when public key extraction fails, for example if the RSA exponent is set to 0. A remote attacker can send a malformed X.509 certificate in a CERT payload to trigger the assertion, causing the pluto daemon to abort and restart. Continued exploitation causes a denial of service. No remote code execution is possible. Both IKEv1 and IKEv2 are affected. The vulnerability is only exploitable when both the OS and libreswan are running in FIPS mode and at least one CA certificate is loaded. The CERT payload is processed before peer authentication, so no credentials are needed to exploit this. Configurations using only PreSharedKey (PSK) authentication with no CA certificates loaded in the NSS database are not vulnerable.

References

Affected packages

Ubuntu:18.04:LTS / libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.20-7build1
3.21-2
3.22-1
3.22-2
3.22-3
3.22-4
3.23-1
3.23-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libreswan",
            "binary_version": "3.23-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14957.json"

Ubuntu:20.04:LTS / libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.29-2
3.29-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libreswan",
            "binary_version": "3.29-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14957.json"

Ubuntu:22.04:LTS / libreswan

Package

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

Affected ranges

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

Affected versions

3.*
3.32-3ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libreswan",
            "binary_version": "3.32-3ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14957.json"

Ubuntu:24.04:LTS / libreswan

Package

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

Affected ranges

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

Affected versions

4.*
4.11-1ubuntu1
4.12-1ubuntu1
4.14-1ubuntu1
4.14-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libreswan",
            "binary_version": "4.14-1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14957.json"

Ubuntu:26.04:LTS / libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=resolute

Affected ranges

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

Affected versions

5.*
5.2-2.2ubuntu1
5.2-2.2ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libreswan",
            "binary_version": "5.2-2.2ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14957.json"