CVE-2026-46433
6.5 MEDIUMlldpd is an implementation of IEEE 802.1ab (LLDP)
Published: 2026-06-09 · Last updated: 2026-06-09
Severity and scoring
- CVSS
- 6.5 MEDIUM
- Vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CWE
- CWE-125
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-46433
- [Other]https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6
- [Other]https://github.com/lldpd/lldpd/pull/787
- [Other]https://github.com/lldpd/lldpd/releases/tag/1.0.22
- [Other]https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3
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