{"id":"CVE-2026-46433","state":"PUBLISHED","title":"lldpd: Heap OOB Read in VLAN Decapsulation memmove","description":"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.","publishedAt":"2026-06-09T22:49:02.749Z","updatedAt":"2026-06-10T18:12:30.269Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["lldpd lldpd"],"affected":[{"vendor":"lldpd","product":"lldpd","versions":[{"version":"< 1.0.22","status":"affected"}]}],"references":["https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3","https://github.com/lldpd/lldpd/pull/787","https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6","https://github.com/lldpd/lldpd/releases/tag/1.0.22"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46433.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46433","state":"PUBLISHED","datePublished":"2026-06-09T22:49:02.749Z","dateUpdated":"2026-06-10T18:12:30.269Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-13T22:18:22.830Z"},"containers":{"cna":{"title":"lldpd: Heap OOB Read in VLAN Decapsulation memmove","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"lldpd","product":"lldpd","versions":[{"version":"< 1.0.22","status":"affected"}]}],"references":[{"url":"https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3","name":"https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/lldpd/lldpd/pull/787","name":"https://github.com/lldpd/lldpd/pull/787","tags":["x_refsource_MISC"]},{"url":"https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6","name":"https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6","tags":["x_refsource_MISC"]},{"url":"https://github.com/lldpd/lldpd/releases/tag/1.0.22","name":"https://github.com/lldpd/lldpd/releases/tag/1.0.22","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-09T22:49:02.749Z"},"source":{"advisory":"GHSA-2g8p-2h3j-63m3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-10T18:12:17.598816Z","id":"CVE-2026-46433","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-10T18:12:30.269Z"}}]}}}