{"id":"DEBIAN-CVE-2026-46433","details":"lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpd_decode() in src/daemon/lldpd.c strips 802.1Q VLAN tags from received Ethernet frames by calling memmove() to shift the frame payload 4 bytes left. The third argument (byte count) is s - 2 * ETHER_ADDR_LEN but should be s - 2 * ETHER_ADDR_LEN - 4, causing a 4-byte heap buffer over-read past the malloc(h_mtu) allocation when the received frame size equals the interface MTU. This issue has been patched in version 1.0.22.","modified":"2026-09-14T17:03:42.986182373Z","published":"2026-06-09T23:16:59.437Z","upstream":["CVE-2026-46433"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-46433"}],"affected":[{"package":{"name":"lldpd","ecosystem":"Debian:12","purl":"pkg:deb/debian/lldpd?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.16-1","1.0.16-1+deb12u1","1.0.17-1","1.0.18-1","1.0.19-1","1.0.21-1","1.0.22-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-46433.json"}},{"package":{"name":"lldpd","ecosystem":"Debian:13","purl":"pkg:deb/debian/lldpd?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.18-1","1.0.19-1","1.0.21-1","1.0.22-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-46433.json"}},{"package":{"name":"lldpd","ecosystem":"Debian:14","purl":"pkg:deb/debian/lldpd?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.22-1"}]}],"versions":["1.0.18-1","1.0.19-1","1.0.21-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-46433.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}