CVE-2026-46433

lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpddecode() 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 * ETHERADDRLEN but should be s - 2 * ETHERADDRLEN - 4, causing a 4-byte heap buffer over-read past the malloc(hmtu) allocation when the received frame size equals the interface MTU. This issue has been patched in version 1.0.22.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46433.json",
    "cwe_ids": [
        "CWE-125"
    ],
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/lldpd/lldpd

Affected ranges

Type

GIT

Repo

https://github.com/lldpd/lldpd

Events

Introduced

Fixed

df8d7298598f4ff4cbb20957ccb4e8e2bde96f06

Fixed

ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6

Database specific

{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:lldpd_project:lldpd:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.0.22"
        }
    ]
}

Affected versions

0.*

0.2

0.2.1

0.3

0.3.1

0.3.2

0.4.0

0.5.0

0.5.1

0.5.2

0.5.4

0.5.5

0.6.0

0.6.1

0.7.0

0.7.1

0.7.10

0.7.11

0.7.12

0.7.13

0.7.14

0.7.15

0.7.16

0.7.2

0.7.3

0.7.4

0.7.5

0.7.6

0.7.7

0.7.8

0.7.9

0.8.0

0.9.0

0.9.1

0.9.2

0.9.3

0.9.4

0.9.5

0.9.6

0.9.7

0.9.8

0.9.9

1.*

1.0.0

1.0.1

1.0.10

1.0.11

1.0.12

1.0.13

1.0.14

1.0.15

1.0.16

1.0.17

1.0.18

1.0.19

1.0.2

1.0.20

1.0.21

1.0.3

1.0.4

1.0.5

1.0.6

1.0.7

1.0.8

1.0.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46433.json"