Vulnerability Details CVE-2026-56116
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 21.4%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-56116
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.0.10
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.0.7
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.0.8
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.0.9
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.1.0
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.2.0
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.2.1
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.2.2
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.2.3
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.2.4
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.3.0
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.3.1
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cpe:2.3:a:dhcpcd_project:dhcpcd:10.3.2