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    1 vulnerability by lldpd

    CVE-2026-46433 (GCVE-0-2026-46433)

    Vulnerability from cvelistv5 – Published: 2026-06-09 22:49 – Updated: 2026-06-10 18:12
    VLAI
    Title
    lldpd: Heap OOB Read in VLAN Decapsulation memmove
    Summary
    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.
    Severity
    6.5 (Medium)
    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    lldpd lldpd Affected: < 1.0.22
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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                "id": "CVE-2026-46433",
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T18:12:17.598816Z",
                "version": "2.0.3"
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          "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."
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      ],
      "metrics": [
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      "references": [
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          "tags": [
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          "url": "https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3"
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        {
          "name": "https://github.com/lldpd/lldpd/pull/787",
          "tags": [
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          "url": "https://github.com/lldpd/lldpd/pull/787"
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      "title": "lldpd: Heap OOB Read in VLAN Decapsulation memmove"
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    "cveId": "CVE-2026-46433",
    "datePublished": "2026-06-09T22:49:02.749Z",
    "dateReserved": "2026-05-13T22:18:22.830Z",
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