CVE-2026-34956
Medium
Description
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Enterprise Linux 7
PublishedMay 5, 2026
First seenMay 5, 2026
Weakness typeCWE-120CWE-120
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| enterprise_linux 7 | No range specified | — |
| enterprise_linux 8 | No range specified | — |
| enterprise_linux 9 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 7 | No range specified | — |
| Red Hat Red Hat OpenShift Container Platform 4 | No range specified | — |
| Red Hat Red Hat OpenStack Platform 13 (Queens) | No range specified | — |
| Red Hat Red Hat OpenStack Platform 16.2 | No range specified | — |
| Red Hat Red Hat OpenStack Platform 17.1 | No range specified | — |
| Red Hat Red Hat OpenStack Platform 18.0 | No range specified | — |
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