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CVE details

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.

Score
6.5 medium
Published
2026-06-09
Links
NVD · cve.org

Affected ports (2)

PortPackageVersionStatusMaintainer
net-mgmt/lldpdlldpd1.0.21unaddressedfreebsd@simweb.ch
net-mgmt/lldpdlldpd-tiny1.0.21unaddressedfreebsd@simweb.ch

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>lldpd</name>
	<range><lt>1.0.22</lt></range>
      </package>
      <package>
	<name>lldpd-tiny</name>
	<range><lt>1.0.22</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>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.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-46433</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-46433</url>
    </references>
    <dates>
      <discovery>2026-06-09</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>