Vulnerability · Published Jun 23, 2026 · Assigned by VulnCheck
CVE-2026-56116dhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling
Medium 6.5
In plain English
A medium-severity memory leak in dhcpcd from NetworkConfiguration. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | dhcpcd | 10.5.2-r0 | ALPINE-CVE-2026-56116 |
| Alpine:v3.24 | dhcpcd | 10.5.2-r0 | ALPINE-CVE-2026-56116 |
| Debian:13 | dhcpcd | 1:10.1.0-11+deb13u3 | DEBIAN-CVE-2026-56116 |
| Debian:14 | dhcpcd | 1:10.3.2-4 | DEBIAN-CVE-2026-56116 |
| Ubuntu:25.10 | dhcpcd | no fix listed | UBUNTU-CVE-2026-56116 |
| Ubuntu:26.04:LTS | dhcpcd | no fix listed | UBUNTU-CVE-2026-56116 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| NetworkConfiguration | dhcpcd | 10.0.7 – through 10.3.2 |
Weakness: CWE-401 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H