CVE-2026-34956
Published:May 05, 2026
Updated:May 15, 2026
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.
Affected Packages
https://github.com/openvswitch/ovs.git (GITHUB):
Affected version(s) =v3.7.0 <v3.7.1Fix Suggestion:
Update to version v3.7.1https://github.com/openvswitch/ovs.git (GITHUB):
Affected version(s) >=v3.5.0 <v3.5.4Fix Suggestion:
Update to version v3.5.4https://github.com/openvswitch/ovs.git (GITHUB):
Affected version(s) >=v3.4.0 <v3.4.6Fix Suggestion:
Update to version v3.4.6https://github.com/openvswitch/ovs.git (GITHUB):
Affected version(s) >=v0.90.0 <v3.3.9Fix Suggestion:
Update to version v3.3.9https://github.com/openvswitch/ovs.git (GITHUB):
Affected version(s) >=v3.6.0 <v3.6.3Fix Suggestion:
Update to version v3.6.3Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
EPSS
Base Score:
0.13