CVE-2026-46433

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{"affected": [{"affectedData": [{"product": "lldpd", "vendor": "lldpd", "versions": [{"status": "affected", "version": "< 1.0.22"}]}], "source": "security-advisories@github.com"}], "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."}, {"lang": "es", "value": "lldpd es una implementaci\u00f3n de IEEE 802.1ab (LLDP). Antes de la versi\u00f3n 1.0.22, lldpd_decode() en src/daemon/lldpd.c elimina las etiquetas VLAN 802.1Q de las tramas Ethernet recibidas al llamar a memmove() para desplazar la carga \u00fatil de la trama 4 bytes a la izquierda. El tercer argumento (recuento de bytes) es s - 2 * ETHER_ADDR_LEN pero deber\u00eda ser s - 2 * ETHER_ADDR_LEN - 4, causando una lectura excesiva de b\u00fafer de pila de 4 bytes m\u00e1s all\u00e1 de la asignaci\u00f3n malloc(h_mtu) cuando el tama\u00f1o de la trama recibida es igual a la MTU de la interfaz. Este problema ha sido parcheado en la versi\u00f3n 1.0.22."}], "id": "CVE-2026-46433", "lastModified": "2026-07-23T09:10:00.113", "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": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46433", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-10T18:12:17.598816Z", "version": "2.0.3"}}]}, "published": "2026-06-09T23:16:59.437", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/lldpd/lldpd/pull/787"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/lldpd/lldpd/releases/tag/1.0.22"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.0.22)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "lldpd", "source": "cna", "vendor": "lldpd"}, "product": "lldpd", "vendor": "lldpd"}], "created": "2026-06-10T00:30:17.083375+00:00", "updated": "2026-06-13T02:00:08.424693+00:00", "vendors": ["lldpd", "lldpd$PRODUCT$lldpd"]}