USN-8852-1

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Source
https://ubuntu.com/security/notices/USN-8852-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8852-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8852-1
Upstream
CVE (2)
Related
UBUNTU (2)
Published
2026-09-30T11:53:54Z
Modified
2026-10-01T00:27:46Z
Summary
openvpn vulnerabilities
Details

It was discovered that OpenVPN had a use-after-free vulnerability in its TLS session handling. An attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-84471)

It was discovered that OpenVPN incorrectly handled retransmissions of ACK packet IDs, which could trigger a timeout integer overflow. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-84732)

References

Affected packages

Ubuntu:22.04:LTS / openvpn

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.5.11-0ubuntu0.22.04.5

Affected versions

2.*
2.5.1-3ubuntu1
2.5.1-3ubuntu2
2.5.1-3ubuntu4
2.5.1-3ubuntu5
2.5.5-1ubuntu1
2.5.5-1ubuntu3
2.5.5-1ubuntu3.1
2.5.9-0ubuntu0.22.04.2
2.5.9-0ubuntu0.22.04.3
2.5.11-0ubuntu0.22.04.1
2.5.11-0ubuntu0.22.04.3
2.5.11-0ubuntu0.22.04.4

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "openvpn",
            "binary_version":  "2.5.11-0ubuntu0.22.04.5"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-84471",
            "severity":  [
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-84732",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8852-1.json"

Ubuntu:24.04:LTS / openvpn

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.6.19-0ubuntu0.24.04.4

Affected versions

2.*
2.6.5-0ubuntu1
2.6.7-1ubuntu1
2.6.9-1ubuntu2
2.6.9-1ubuntu3
2.6.9-1ubuntu4
2.6.9-1ubuntu4.1
2.6.12-0ubuntu0.24.04.1
2.6.12-0ubuntu0.24.04.3
2.6.14-0ubuntu0.24.04.1
2.6.14-0ubuntu0.24.04.2
2.6.14-0ubuntu0.24.04.3
2.6.19-0ubuntu0.24.04.1
2.6.19-0ubuntu0.24.04.2
2.6.19-0ubuntu0.24.04.3

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "openvpn",
            "binary_version":  "2.6.19-0ubuntu0.24.04.4"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-84471",
            "severity":  [
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-84732",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8852-1.json"

Ubuntu:26.04:LTS / openvpn

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.7.0-1ubuntu1.3

Affected versions

2.*
2.6.14-2ubuntu1
2.6.15-1ubuntu1
2.7.0~rc5-1ubuntu5
2.7.0~rc6-1ubuntu1
2.7.0-1ubuntu1
2.7.0-1ubuntu1.1
2.7.0-1ubuntu1.2

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "openvpn",
            "binary_version":  "2.7.0-1ubuntu1.3"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-84471",
            "severity":  [
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-84732",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8852-1.json"