CVE-2026-46433 | THREATINT

Description

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.

PUBLISHED Reserved 2026-05-13 | Published 2026-06-09 | Updated 2026-06-10 | Assigner GitHub_M

MEDIUM: 6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-125: Out-of-bounds Read

Product status

< 1.0.22

affected

References

github.com/.../lldpd/security/advisories/GHSA-2g8p-2h3j-63m3

github.com/lldpd/lldpd/pull/787

github.com/...ommit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6

github.com/lldpd/lldpd/releases/tag/1.0.22

cve.org (CVE-2026-46433)

nvd.nist.gov (CVE-2026-46433)

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