CVE-2026-46433

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Published 2026-06-09 · Modified 2026-06-10

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CVSS v3

6.5

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

6.5

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.

Predictions

Exploit likelihood

65%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-46433 NameCVE-2026-46433 Descriptionlldpd 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…

CVE-2026-46433

Name	CVE-2026-46433
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
lldpd (PTS)	bullseye (security), bullseye	1.0.11-1+deb11u2	vulnerable
	bookworm, bookworm (security)	1.0.16-1+deb12u1	vulnerable
	trixie	1.0.18-1	vulnerable
	forky, sid	1.0.22-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
lldpd	source	(unstable)	1.0.22-1

Notes

[trixie] - lldpd <no-dsa> (Minor issue)
[bookworm] - lldpd <no-dsa> (Minor issue)
[bullseye] - lldpd <postponed> (Minor issue, OOB read / DoS)
https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3
https://github.com/lldpd/lldpd/pull/787
Fixed by: https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6 (1.0.22)

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

[trixie] - lldpd <no-dsa> (Minor issue)[bookworm] - lldpd <no-dsa> (Minor issue)[bullseye] - lldpd <postponed> (Minor issue, OOB read / DoS)https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3https://github.com/lldpd/lldpd/pull/787Fixed by: https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6 (1.0.22)

OS impact

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Affected	—
sid	Fixed	`1.0.22-1`
forky	Fixed	`1.0.22-1`
bullseye	Affected	—
bookworm	Affected	—

References

CWEs

CWE-125

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.