CVE-2026-34956
Openvswitch: open vswitch: denial of service via malformed ftp epasv command
5.9CVSSMEDIUM
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.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
and 4 more affected products View all →
Attack Graph
Products CVE Techniques Tactics
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Exploitability
Workaround Available
MITRE ATT&CK
2 techniques Initial Access
Privilege Escalation
References
Timeline
Published
May 5, 2026
Last Updated
May 5, 2026
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