VDB
CVE-2026-46433
CVE-2026-46433
PUBLISHED
CVSS 6.5 MEDIUM
Reported by GitHub_M · Published June 9, 2026
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.
Risk Scores
CVSS v3.1
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| lldpd | lldpd | < 1.0.22 |
| alpine | lldpd | 0, 0, 0 |
| lldpd | lldpd | < 1.0.22, < 1.0.22 |
Timeline
- May 20, 2026 CVE Published
References
- https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3 x_refsource_CONFIRM
- https://github.com/lldpd/lldpd/pull/787 x_refsource_MISC
- https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6 x_refsource_MISC
- https://github.com/lldpd/lldpd/releases/tag/1.0.22 x_refsource_MISC