UBUNTU-CVE-2026-77205

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Source
https://ubuntu.com/security/CVE-2026-77205
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77205.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-77205
Upstream
  • CVE-2026-77205
Published
2026-10-13T22:18:00Z
Modified
2026-10-17T13:01:07Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted from the NSS cache. As a result, any real certificates with the same serial number are rejected as well. This can be abused to lock out legitimate peers from connecting. The add_decoded_cert() function missed a call to CERT_DestroyCertificate() due to an incorrect fix for CVE-2026-14957. Sending bogus certificates with new serial numbers could prevent the real certificates with those serial numbers from connecting until the service has restarted.

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-2026-77205.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-2026-77205.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-2026-77205.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-2026-77205.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-2026-77205.json"
Ubuntu:26.10
libreswan

Package

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

Affected ranges

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

Affected versions

5.*
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-2026-77205.json"