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OpenStack Platform 17.1","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoso-openvswitch","product":"Red Hat OpenStack Platform 18.0","source":"CNA: redhat","vendor":"Red Hat","versions":[]}],"cveId":"CVE-2026-34956","cwes":["CWE-120"],"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.","epss":{"date":"2026-11-01","percentile":0.34781,"score":0.00405},"exploits":[],"kev":null,"metrics":[{"score":5.9,"severity":"medium","source":"CNA: redhat","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793582929599,"publishedAt":1777995904638,"references":[{"source":"CNA: redhat","tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-34956"},{"source":"CNA: redhat","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2453459"},{"source":"ADP: CVE","tags":[],"url":"http://www.openwall.com/lists/oss-security/2026/03/31/15"}],"remediation":[{"kind":"workaround","source":"CNA: redhat","text":"Optionally, avoid using alg=ftp flows. These are not usually configured."}],"revision":"926b97513ccbb6f7d766cfbda173ad94486ae59b42489b75453520e97443ad4e","sources":[{"modifiedAt":1793582929599,"name":"CNA: redhat","retrievedAt":1793585304342,"url":"https://www.cve.org/CVERecord?id=CVE-2026-34956"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793585311678,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-34956"}],"ssvc":{"assessedAt":1778077043457,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Openvswitch: open vswitch: denial of service via malformed ftp epasv command","updatedAt":1793585311678}