CVE-2026-34956

medium Red Hat
CVSS v3 Base Score
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.1%
Exploitation probability in 30 days
Top 68% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: March 31, 2026 (101 days ago)
Last Modified: March 31, 2026
Vendor: Red Hat
Source: REDHAT

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.

CWE

CWE-120

Affected Products

Fast Datapath for RHEL 7Fast Datapath for RHEL 8Fast Datapath for RHEL 9Red Hat Enterprise Linux 7Red Hat OpenShift Container Platform 4Red Hat OpenStack Platform 13 (Queens)Red Hat OpenStack Platform 16.2Red Hat OpenStack Platform 17.1Red Hat OpenStack Platform 18.0

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov