CVE-2026-46433

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Source
https://cve.org/CVERecord?id=CVE-2026-46433
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46433.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-46433
Aliases
  • GHSA-2g8p-2h3j-63m3
Downstream
Related
Published
2026-06-09T22:49:02Z
Modified
2026-08-12T16:09:38Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
lldpd: Heap OOB Read in VLAN Decapsulation memmove
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.

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

Affected packages

Git / github.com/lldpd/lldpd

Affected ranges

Type
GIT
Repo
https://github.com/lldpd/lldpd
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
df8d7298598f4ff4cbb20957ccb4e8e2bde96f06
Fixed
ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:lldpd_project:lldpd:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.0.22"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

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"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "269138232962421736849465712517278766716",
                "324153637813939746628893843897270463750",
                "212684008719317262962762967379558058820",
                "189184095575573403431166328603862703866"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-46433-9df2adc5",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6",
        "target": {
            "file": "src/daemon/lldpd.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "226826361221517381670100122512946621289",
            "length": 5456
        },
        "id": "CVE-2026-46433-eb37bab8",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6",
        "target": {
            "file": "src/daemon/lldpd.c",
            "function": "lldpd_decode"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T16:09:38Z"