CVE-2026-34956— Openvswitch: open vswitch: denial of service via malformed ftp epasv command
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I. Basic Information for CVE-2026-34956
Vulnerability Information
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Vulnerability Title
Openvswitch: open vswitch: denial of service via malformed ftp epasv command
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Open vSwitch 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open vSwitch是Collaborative Project开源的一个虚拟交换机。 Open vSwitch存在安全漏洞，该漏洞源于配置使用FTP辅助程序的conntrack流时，远程攻击者可发送特制FTP流导致堆访问错误，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Red Hat Enterprise Linux 7 | - | cpe:/o:redhat:enterprise_linux:7 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 | |
| Red Hat | Red Hat OpenStack Platform 13 (Queens) | - | cpe:/a:redhat:openstack:13 | |
| Red Hat | Red Hat OpenStack Platform 13 (Queens) | - | cpe:/a:redhat:openstack:13 | |
| Red Hat | Red Hat OpenStack Platform 13 (Queens) | - | cpe:/a:redhat:openstack:13 | |
| Red Hat | Red Hat OpenStack Platform 16.2 | - | cpe:/a:redhat:openstack:16.2 | |
| Red Hat | Red Hat OpenStack Platform 16.2 | - | cpe:/a:redhat:openstack:16.2 | |
| Red Hat | Red Hat OpenStack Platform 17.1 | - | cpe:/a:redhat:openstack:17.1 | |
| Red Hat | Red Hat OpenStack Platform 17.1 | - | cpe:/a:redhat:openstack:17.1 | |
| Red Hat | Red Hat OpenStack Platform 18.0 | - | cpe:/a:redhat:openstack:18.0 |
II. Public POCs for CVE-2026-34956
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|---|
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- 2453459 – (CVE-2026-34956) CVE-2026-34956 openvswitch: Open vSwitch: Denial of Service via malformed FTP EPASV commandissue-trackingx_refsource_REDHAT
- https://nvd.nist.gov/vuln/detail/CVE-2026-34956
Same Patch Batch · Red Hat · 2026-05-05 · 3 CVEs total
| CVE-2026-34002 | 6.1 MEDIUM | Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bou |
| CVE-2026-34000 | 6.1 MEDIUM | Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bo |
IV. Related Vulnerabilities
Same vendor: Red Hat
- CVE-2026-42011
Gnutls: gnutls: security bypass due to incorrect name constr - CVE-2026-42010
Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote - CVE-2026-34002
Xorg: xwayland: x.org x server: information disclosure or de - CVE-2026-34000
Xwayland: xorg: x.org x server: information disclosure and d
Same weakness: CWE-120
- CVE-2026-8260
D-Link DCS-935L HNAP Service hnap_service SetDeviceSettings - CVE-2026-8137
Totolink X5000R formDdns sub_458E40 buffer overflow - CVE-2026-6691
MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow - CVE-2026-7857
D-Link DI-8100 CGI user_group.asp sprintf buffer overflow - CVE-2026-7856
D-Link DI-8100 Web Management url_member.asp buffer overflow
V. Comments for CVE-2026-34956
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