# Openvswitch: open vswitch: denial of service via malformed ftp epasv command CVE record · `CVE-2026-34956` - **Identifiers:** `CVE-2026-34956` - **State:** Confirmed - **Severity:** CVSS 5.9 Medium - **Critical:** No - **CNA:** redhat - **Weakness (CWE):** [CWE-120](https://cwe.mitre.org/data/definitions/120.html) - **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) - **Technologies:** [Red Hat Fast Datapath for RHEL 7](https://agentprime.io/advisories/technology/red-hat-fast-datapath-for-rhel-7.md) · [Red Hat Fast Datapath for RHEL 8](https://agentprime.io/advisories/technology/red-hat-fast-datapath-for-rhel-8.md) · [Red Hat Fast Datapath for RHEL 9](https://agentprime.io/advisories/technology/red-hat-fast-datapath-for-rhel-9.md) · [Red Hat Enterprise Linux 7](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-7.md) · [Red Hat OpenShift Container Platform 4](https://agentprime.io/advisories/technology/red-hat-openshift-container-platform-4.md) · [Red Hat OpenStack Platform 13 (Queens)](https://agentprime.io/advisories/technology/red-hat-openstack-platform-13-queens.md) · [Red Hat OpenStack Platform 16.2](https://agentprime.io/advisories/technology/red-hat-openstack-platform-16-2.md) · [Red Hat OpenStack Platform 17.1](https://agentprime.io/advisories/technology/red-hat-openstack-platform-17-1.md) · [Red Hat OpenStack Platform 18.0](https://agentprime.io/advisories/technology/red-hat-openstack-platform-18-0.md) - **Published:** 5 May 2026 - **Updated:** 5 Nov 2026 - **Reviewed by a person:** No Published by the CVE Program (CNA: redhat) at 5 May 2026, 15:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. ## Affected products, as the CNA wrote them - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `openvswitch` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `openvswitch2.10` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `openvswitch2.11` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `openvswitch2.12` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `openvswitch2.13` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `openvswitch-selinux-extra-policy` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `ovn2.11` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 7. - No versions given - Other versions: affected - Package name: `ovn2.12` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch2.11` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch2.12` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch2.13` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch2.15` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch2.16` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch2.17` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch3.1` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `openvswitch-selinux-extra-policy` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `ovn2.11` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 8. - No versions given - Other versions: affected - Package name: `ovn2.12` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch2.17` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch3.0` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch3.1` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch3.2` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch3.3` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch3.4` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch3.5` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch3.6` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Fast Datapath for RHEL 9. - No versions given - Other versions: affected - Package name: `openvswitch-selinux-extra-policy` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat Enterprise Linux 7. - No versions given - Other versions: affected - Package name: `openvswitch` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4. - No versions given - Other versions: affected - Package name: `openshift/ose-rhel-coreos-8` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4. - No versions given - Other versions: affected - Package name: `openshift/ose-rhel-coreos-9` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4. - No versions given - Other versions: affected - Package name: `openvswitch2.17` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4. - No versions given - Other versions: affected - Package name: `openvswitch3.0` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenShift Container Platform 4. - No versions given - Other versions: affected - Package name: `openvswitch3.1` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenStack Platform 13 (Queens). - No versions given - Other versions: affected - Package name: `rhosp13/openstack-neutron-openvswitch-agent` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenStack Platform 13 (Queens). - No versions given - Other versions: affected - Package name: `rhosp13/openstack-openvswitch-base` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenStack Platform 13 (Queens). - No versions given - Other versions: affected - Package name: `rhosp13/openstack-ovn-base` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenStack Platform 16.2. - No versions given - Other versions: affected - Package name: `rhosp-openvswitch` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenStack Platform 16.2. - No versions given - Other versions: affected - Package name: `rhosp-rhel8/openstack-neutron-openvswitch-agent` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenStack Platform 17.1. - No versions given - Other versions: affected - Package name: `rhosp-openvswitch` - Collection: `https://access.redhat.com/downloads/content/package-browser/` - Vendor: Red Hat. Product: Red Hat OpenStack Platform 17.1. - No versions given - Other versions: affected - Package name: `rhosp-rhel9/openstack-neutron-openvswitch-agent` - Collection: `https://access.redhat.com/downloads/content/package-browser/` And 1 more products. The full list is on the CVE record: ## Not analysed yet We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter. ## Severity and exploitation - 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (redhat) - **CISA KEV:** Not listed. - **EPSS:** 0.0040, the 34th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 5 May 2026, 15:45 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-34956) - 5 May 2026, 16:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-34956) ## Sources - [CVE List: CVE-2026-34956](https://www.cve.org/CVERecord?id=CVE-2026-34956) - [NVD: CVE-2026-34956](https://nvd.nist.gov/vuln/detail/CVE-2026-34956) ### References from the CNA - (vdb-entry, redhat) - (issue-tracking, redhat) Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .