CVE-2026-46433
Last modified
CVE-2026-46433 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Lldpd Project | Lldpd | < 1.0.22 |
References
- https://github.com/lldpd/lldpd/pull/787Issue Tracking, Patch
- https://github.com/lldpd/lldpd/releases/tag/1.0.22Product, Release Notes
Timeline
- Published
- Last Modified
- Status
- Analyzed
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