CVE-2026-56116 | dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a m… | CVSS 6.5 MEDIUM

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.

Metadata

CVE ID: CVE-2026-56116
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-18 19:15 UTC
Published: 2026-06-23 16:11 UTC
Last updated: 2026-06-23 17:03 UTC
Primary CWE: CWE-401
Missing Release of Memory after Effective Lifetime
Vendor / Product: NetworkConfiguration / dhcpcd
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
NetworkConfiguration	dhcpcd	—	0 ≤ 10.3.2, 708b4a56bae080a5b18c2e0c4c6fbe103131a2b0

Weakness (CWE)

CWE	Source	Description
CWE-401	cna	Missing Release of Memory after Effective Lifetime

CVSS scores (2)

Score	Severity	Version	Source	Vector
7.1	HIGH	4.0	cna	CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (2)