CVE-2026-34956
Openvswitch: open vswitch: denial of service via malformed ftp epasv command
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 5.9EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
05 May 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Red Hat · Fast Datapath for RHEL 7Red Hat · Fast Datapath for RHEL 8Red Hat · Fast Datapath for RHEL 9Red Hat · Red Hat Enterprise Linux 7Red Hat · Red Hat OpenShift Container Platform 4Red Hat · Red Hat OpenStack Platform 13 (Queens)Red Hat · Red Hat OpenStack Platform 16.2Red Hat · Red Hat OpenStack Platform 17.1Red Hat · Red Hat OpenStack Platform 18.0Want to know if your infrastructure is exposed to this?
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