TI-2026-34144 Aliases CVE-2026-46433

lldpd: Heap OOB Read in VLAN Decapsulation memmove

LOW 28CWE-125Published 2026-06-09 · Updated 2026-06-10

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00225 13th percentileScored 2026-11-07

Fix Partial lldpd (lldpd): 1.0.22Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
lldpd	lldpd	before 1.0.22	1.0.22	Patch available	CNA

lldpd Vendorlldpd Affected before 1.0.22 Fixed in 1.0.22 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:lldpd_project:lldpd::::::::	before 1.0.22	Vulnerable	Lldpd Project

cpe:2.3:a:lldpd_project:lldpd:*:*:*:*:*:*:*:* Versions before 1.0.22 Vulnerable ·Lldpd Project

Remediation

Fix · CNA lldpd (lldpd) Fixed in 1.0.22

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-46433

References

Patch 2

Advisory 1

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

Other 1

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

TI-2023-22298 An issue was discovered in lldpd before 1.0.17. CVSS 3.1CRITICAL 9.8
TI-2015-06661 Buffer overflow in the lldp_decode function in daemon/protocols/lldp.c in lldpd before… CVSS 3.1CRITICAL 9.8
TI-2020-16898 Uncontrolled resource consumption in lldp/openvswitch CVSS 3.1HIGH 7.5
TI-2021-19480 In lldpd before 1.0.13, when decoding SONMP packets in the sonmp_decode function, it's… CVSS 3.1HIGH 7.5
TI-2015-06662 lldpd before 0.8.0 allows remote attackers to cause a denial of service (assertion… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences