How severe is CVE-2026-46433?

CVE-2026-46433 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-46433 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-46433?

CVE-2026-46433 affects Lldpd Project Lldpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-46433?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-46433 have an EU (EUVD) identifier?

Yes. CVE-2026-46433 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35858.

When was CVE-2026-46433 published?

CVE-2026-46433 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2026-46433

CVE-2026-46433 is a medium-severity vulnerability in Lldpd Project Lldpd with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35858
Weakness: CWE-125
Affected product: Lldpd Project Lldpd
Published: 2026-06-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-46433?: 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.
How severe is CVE-2026-46433?: CVE-2026-46433 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-46433 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-46433?: CVE-2026-46433 affects Lldpd Project Lldpd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-46433?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-46433 have an EU (EUVD) identifier?: Yes. CVE-2026-46433 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35858.
When was CVE-2026-46433 published?: CVE-2026-46433 was published on 2026-06-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lldpd_project:lldpd:*:*:*:*:*:*:*:*

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