CVE-2026-56116

MediumCVSS 6.5/10Last modified Oct 25, 2026

Description

dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo_findalloc() that cause linear memory exhaustion and eventual daemon crash.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-401

Affected software

Vendor	Product	Versions
NetworkConfiguration	dhcpcd	>= 10.0.7, <= 10.3.2

References

Timeline

Published: Jun 23, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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