{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-34956", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-03-31T17:43:41.756Z", "datePublished": "2026-05-05T15:45:04.638Z", "dateUpdated": "2026-09-01T12:01:18.300Z" }, "containers": { "cna": { "title": "Openvswitch: open vswitch: denial of service via malformed ftp epasv command", "metrics": [ { "other": { "content": { "value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "format": "CVSS" } ], "descriptions": [ { "lang": "en", "value": "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": [ { "vendor": "Red Hat", "product": "Fast Datapath for RHEL 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openvswitch", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:7::fastdatapath" ] }, { "vendor": "Red Hat", "product": "Fast Datapath for RHEL 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openvswitch2.10", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:7::fastdatapath" ] }, { "vendor": "Red Hat", "product": "Fast Datapath for RHEL 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openvswitch2.11", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:7::fastdatapath" ] }, { "vendor": "Red Hat", "product": "Fast Datapath for RHEL 7", 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