{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46433", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-13T22:18:22.830Z", "datePublished": "2026-06-09T22:49:02.749Z", "dateUpdated": "2026-06-10T18:12:30.269Z"}, "containers": {"cna": {"title": "lldpd: Heap OOB Read in VLAN Decapsulation memmove", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}], "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"}}], "references": [{"name": "https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3"}, {"name": "https://github.com/lldpd/lldpd/pull/787", "tags": ["x_refsource_MISC"], "url": "https://github.com/lldpd/lldpd/pull/787"}, {"name": "https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6", "tags": ["x_refsource_MISC"], "url": "https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6"}, {"name": "https://github.com/lldpd/lldpd/releases/tag/1.0.22", "tags": ["x_refsource_MISC"], "url": "https://github.com/lldpd/lldpd/releases/tag/1.0.22"}], "affected": [{"vendor": "lldpd", "product": "lldpd", "versions": [{"version": "< 1.0.22", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-09T22:49:02.749Z"}, "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."}], "source": {"advisory": "GHSA-2g8p-2h3j-63m3", "discovery": "UNKNOWN"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-10T18:12:30.269Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:lldpd_project:lldpd:*:*:*:*:*:*:*:*", "matchCriteriaId": "DDD2CB1A-89DE-492A-B447-67FAAE9FC9A9", "versionEndExcluding": "1.0.22", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-46433", "lastModified": "2026-06-11T18:29:26.930", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-06-09T23:16:59.437", "references": [{"source": "[email protected]", "tags": ["Patch"], "url": "https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6"}, {"source": "[email protected]", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/lldpd/lldpd/pull/787"}, {"source": "[email protected]", "tags": ["Product", "Release Notes"], "url": "https://github.com/lldpd/lldpd/releases/tag/1.0.22"}, {"source": "[email protected]", "tags": ["Vendor Advisory"], "url": "https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames", "id": "2487363", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487363"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-131", "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.", "A flaw was found in lldpd, an implementation of IEEE 802.1ab (LLDP). A remote attacker on the adjacent network can send specially crafted Ethernet frames with 802.1Q VLAN (Virtual Local Area Network) tags. This can cause a 4-byte heap buffer over-read, leading to a denial of service (DoS) due to an application crash. This vulnerability occurs when the received frame size equals the interface Maximum Transmission Unit (MTU)."], "name": "CVE-2026-46433", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "lldpd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "lldpd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "lldpd", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-09T22:49:02Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46433\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46433\nhttps://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6\nhttps://github.com/lldpd/lldpd/pull/787\nhttps://github.com/lldpd/lldpd/releases/tag/1.0.22\nhttps://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3"], "threat_severity": "Moderate"}

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