CVE-2026-56116
dhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-401 |
| Vendor | networkconfiguration |
| Product | dhcpcd |
| Published | Jun 23, 2026 |
| Last Updated | Jun 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
NetworkConfiguration / dhcpcd
0 ≤ 10.3.2
References
Credits
CuB3y0nd VulnCheck