Vulnerabilities CVE-2026-34956

CVE-2026-34956

Medium

Open

TLP:CLEAR

Openvswitch: open vswitch: denial of service via malformed ftp epasv command

NVD CVE.org

DDoS

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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.

Details

CVSS Score: 5.9
EPSS Score ⓘ: 0.40%

33.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: May 5, 2026
Last Modified: Aug 21, 2026

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