UBUNTU-CVE-2026-34956

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-34956
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34956.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-34956
Upstream
  • CVE-2026-34956
Published
2026-05-05T16:16:00Z
Modified
2026-08-13T07:45:12Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in Open vSwitch. When Open vSwitch is configured with a conntrack flow using FTP helpers over the userspace datapath, a remote attacker can send a specially crafted FTP stream with an EPASV command exceeding 255 characters. This heap access error can lead to a crash, resulting in a Denial of Service (DoS) for the affected system.

References

Affected packages

Ubuntu:20.04:LTS
openvswitch

Package

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

Affected ranges

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

Affected versions

2.*
2.12.0-0ubuntu1
2.12.0-0ubuntu2
2.12.1~git20191107.7accd1302-0ubuntu1
2.12.90~git20200107.af683565b-0ubuntu1
2.12.90~git20200107.af683565b-0ubuntu2
2.12.90~git20200107.af683565b-0ubuntu3
2.13.0~git20200127.dbdf66c29-0ubuntu2
2.13.0~git20200212.15ae9db33-0ubuntu1
2.13.0~git20200212.15ae9db33-0ubuntu2
2.13.0-0ubuntu1
2.13.1-0ubuntu0.20.04.1
2.13.1-0ubuntu0.20.04.3
2.13.1-0ubuntu0.20.04.4
2.13.3-0ubuntu0.20.04.1
2.13.3-0ubuntu0.20.04.2
2.13.5-0ubuntu1
2.13.8-0ubuntu1
2.13.8-0ubuntu1.1
2.13.8-0ubuntu1.2
2.13.8-0ubuntu1.3
2.13.8-0ubuntu1.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvswitch-common",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "openvswitch-pki",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "openvswitch-source",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "openvswitch-switch",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "openvswitch-switch-dpdk",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "openvswitch-test",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "openvswitch-testcontroller",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "openvswitch-vtep",
            "binary_version": "2.13.8-0ubuntu1.4"
        },
        {
            "binary_name": "python3-openvswitch",
            "binary_version": "2.13.8-0ubuntu1.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34956.json"
Ubuntu:22.04:LTS
openvswitch

Package

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

Affected ranges

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

Affected versions

2.*
2.16.0-0ubuntu2
2.16.0-0ubuntu3
2.16.0-0ubuntu4
2.17.0~git20220105.0d1ffb7-0ubuntu1
2.17.0~git20220118.1b9fd88-0ubuntu1
2.17.0~git20220121.109d024-0ubuntu1
2.17.0-0ubuntu1
2.17.2-0ubuntu0.22.04.1
2.17.2-0ubuntu0.22.04.2
2.17.3-0ubuntu0.22.04.1
2.17.3-0ubuntu0.22.04.2
2.17.5-0ubuntu0.22.04.2
2.17.7-0ubuntu0.22.04.1
2.17.8-0ubuntu0.22.04.1
2.17.9-0ubuntu0.22.04.1
2.17.9-0ubuntu0.22.04.2
2.17.12-0ubuntu0.22.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvswitch-common",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-ipsec",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-pki",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-source",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-switch",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-switch-dpdk",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-test",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-testcontroller",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "openvswitch-vtep",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "python3-openvswitch",
            "binary_version": "2.17.12-0ubuntu0.22.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34956.json"
Ubuntu:24.04:LTS
openvswitch

Package

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

Affected ranges

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

Affected versions

3.*
3.2.0-1
3.2.0-2
3.2.0-2build1
3.2.2~git20231029-2
3.2.2~git20231029-2build1
3.3.0~git20240118.e802fe7-2
3.3.0~git20240118.e802fe7-3
3.3.0-1
3.3.0-1build1
3.3.0-1ubuntu1
3.3.0-1ubuntu3
3.3.0-1ubuntu3.1
3.3.0-1ubuntu3.2
3.3.4-0ubuntu0.24.04.1
3.3.4-0ubuntu0.24.04.2
3.3.9-0ubuntu0.24.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvswitch-common",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-ipsec",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-pki",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-source",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-switch",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-switch-dpdk",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-test",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-testcontroller",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "openvswitch-vtep",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        },
        {
            "binary_name": "python3-openvswitch",
            "binary_version": "3.3.9-0ubuntu0.24.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34956.json"
Ubuntu:25.10
openvswitch

Package

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

Affected ranges

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

Affected versions

3.*
3.5.0-1build1
3.5.1-0ubuntu1
3.6.0-1
3.6.0-2
3.6.0-2ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvswitch-common",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-ipsec",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-pki",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-source",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-switch",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-switch-dpdk",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-test",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-testcontroller",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "openvswitch-vtep",
            "binary_version": "3.6.0-2ubuntu0.1"
        },
        {
            "binary_name": "python3-openvswitch",
            "binary_version": "3.6.0-2ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34956.json"
Ubuntu:26.04:LTS
openvswitch

Package

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

Affected ranges

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

Affected versions

3.*
3.6.0-2
3.6.0-2build1
3.6.0-5
3.6.0-6
3.6.0-6build1
3.6.0-6ubuntu2
3.7.0~git20260211.8c6ebf8-1~1.gbp9127d1
3.7.0-1
3.7.0-1build1
3.7.1-1
3.7.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvswitch-common",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-ipsec",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-pki",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-source",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-switch",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-switch-dpdk",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-test",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-testcontroller",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "openvswitch-vtep",
            "binary_version": "3.7.1-2"
        },
        {
            "binary_name": "python3-openvswitch",
            "binary_version": "3.7.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34956.json"
Ubuntu:Pro:18.04:LTS
openvswitch

Package

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

Affected ranges

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

Affected versions

2.*
2.8.0-0ubuntu2
2.8.1-0ubuntu2
2.8.1-0ubuntu3
2.9.0~git20180205.5a39582ca-0ubuntu1
2.9.0-0ubuntu1
2.9.2-0ubuntu0.18.04.2
2.9.2-0ubuntu0.18.04.3
2.9.5-0ubuntu0.18.04.1
2.9.7-0ubuntu0.18.04.2
2.9.8-0ubuntu0.18.04.2
2.9.8-0ubuntu0.18.04.3
2.9.8-0ubuntu0.18.04.4
2.9.8-0ubuntu0.18.04.5
2.9.8-0ubuntu0.18.04.5+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvswitch-common",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "openvswitch-pki",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "openvswitch-switch",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "openvswitch-switch-dpdk",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "openvswitch-test",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "openvswitch-testcontroller",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "openvswitch-vtep",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "ovn-central",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "ovn-common",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "ovn-docker",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "ovn-host",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "python-openvswitch",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        },
        {
            "binary_name": "python3-openvswitch",
            "binary_version": "2.9.8-0ubuntu0.18.04.5+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34956.json"