{"id":"DEBIAN-CVE-2026-34956","details":"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.","modified":"2026-09-14T17:03:08.965325613Z","published":"2026-05-05T16:16:11.927Z","upstream":["CVE-2026-34956"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-34956"}],"affected":[{"package":{"name":"openvswitch","ecosystem":"Debian:12","purl":"pkg:deb/debian/openvswitch?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.0-2","3.1.0-2+deb12u1","3.1.2-1","3.1.2-2","3.1.2-3","3.1.2-4","3.2.0-1","3.2.0-2","3.2.2~git20231029-1","3.2.2~git20231029-2","3.3.0-1","3.3.0-2","3.3.0-3","3.3.0-4","3.3.0-5","3.3.0~git20240118.e802fe7-1","3.3.0~git20240118.e802fe7-2","3.3.0~git20240118.e802fe7-3","3.3.1-1","3.4.0-1","3.5.0-1","3.5.0~git20241129.2af7cef-1","3.5.0~git20241129.2af7cef-2","3.6.0-1","3.6.0-2","3.6.0-3","3.6.0-5","3.6.0-6","3.6.0-7","3.7.0-1","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d1","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d2","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d3","3.7.1-1","3.7.1-2","3.7.1-3","4.0.0-1","4.0.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34956.json"}},{"package":{"name":"openvswitch","ecosystem":"Debian:13","purl":"pkg:deb/debian/openvswitch?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.0-1","3.6.0-1","3.6.0-2","3.6.0-3","3.6.0-5","3.6.0-6","3.6.0-7","3.7.0-1","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d1","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d2","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d3","3.7.1-1","3.7.1-2","3.7.1-3","4.0.0-1","4.0.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34956.json"}},{"package":{"name":"openvswitch","ecosystem":"Debian:14","purl":"pkg:deb/debian/openvswitch?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.7.1-1"}]}],"versions":["3.5.0-1","3.6.0-1","3.6.0-2","3.6.0-3","3.6.0-5","3.6.0-6","3.6.0-7","3.7.0-1","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d1","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d2","3.7.0~git20260211.8c6ebf8-1~1.gbp9127d3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34956.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}