Openvswitch: open vswitch: denial of service via malformed ftp epasv command
CVE-2026-34956 is fixed in openvswitch on 1 platform, first by SUSE-SU-2026:1439-1, released April 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| openvswitch · Debian 14 | 3.7.1-1 | DEBIAN-CVE-2026-34956 | May 15, 2026 |
| openvswitch · opensuse-leap 16.0 | 3.5.4-160000.4.1 | OPENSUSE-SU-2026:20972-1 | Jun 17, 2026 |
| openvswitch · sles 15.7 | 3.5.4-150700.41.15.1 | SUSE-SU-2026:1439-1 | Apr 17, 2026 |
| openvswitch · sles 16.0 | 3.5.4-160000.4.1 | SUSE-SU-2026:22152-1 | Jun 17, 2026 |
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