Medium [CVE-2026-34956] Openvswitch: open vswitch: denial of service via malformed ftp epasv command
This medium-severity Red Hat Linux advisory covers CVE-2026-34956 affecting Fast Datapath for RHEL 7, Fast Datapath for RHEL 8, Fast Datapath for RHEL 9.
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Summary
A flaw was found in Open vSwitch. This heap access error can lead to a crash, resulting in a Denial of Service (DoS) for the affected system.
Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-120.
Affected Red Hat products: Fast Datapath for RHEL 7; Fast Datapath for RHEL 8; Fast Datapath for RHEL 9; Red Hat Enterprise Linux 7; Red Hat OpenShift Container Platform 4; Red Hat OpenStack Platform 13 (Queens); Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1; Red Hat OpenStack Platform 18.0.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: openvswitch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 48 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 48 minutes ago·verify at source
Mitigation checklist
- Optionally, avoid using alg=ftp flows. These are not usually configured.
Official advisory · high-confidence parse· fetched 48 minutes ago·verify at source
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