6.5

CVE-2026-46433: lldpd: Heap OOB Read in VLAN Decapsulation memmove

Analyzed
AliasesUBUNTU-CVE-2026-46433DEBIAN-CVE-2026-46433openSUSE-SU-2026:10794-1
Published 09-06-2026Last modified 10-06-2026

Vulnerability summary

CVE-2026-46433 is a medium (CVSS 6.5) Out-of-bounds Read vulnerability in lldpd_project lldpd. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 13.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.5, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · -0.15 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 09-06-2026
    PublishedVulnerability first disclosed.
  2. 10-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

Decrease -0.15 pp

From 0.37% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Opensuse2 products
  • lldpd&distro=openSUSE Leap 16.0< 1.0.22-bp160.1.1
  • lldpd&distro=openSUSE Tumbleweed< 1.0.22-1.1
Ubuntu2 products
  • lldpdAll versions (No fix recorded)
  • openvswitchAll versions (No fix recorded)
Alpine1 product
  • lldpd< 1.0.22-r0
Debian1 product
  • lldpdAll versions (No fix recorded) | < 1.0.22-1
Lldpd1 product
Lldpd_project1 product

6 vendors · 8 products

References

10 links