dhcpcd — security advisory

{
  "id": "646b892678a3991d6cdda429dae93a6da2e5d78fca0bf571faf27028a084e9e0",
  "url": "https://osv.dev/vulnerability/ALPINE-CVE-2026-56116",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALPINE-CVE-2026-56116",
    "summary": "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.",
    "evidence": "osv:ALPINE-CVE-2026-56116",
    "products": [
      {
        "name": {
          "value": "dhcpcd",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "10.5.2-r0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "dhcpcd",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "10.5.2-r0",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "ALPINE-CVE-2026-56116",
      "aliases": [
        "ALPINE-CVE-2026-56116"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "10.0.7"
                },
                {
                  "fixed": "10.5.2-r0"
                }
              ]
            }
          ],
          "package": {
            "name": "dhcpcd",
            "purl": "pkg:apk/alpine/dhcpcd?arch=source",
            "ecosystem": "Alpine:v3.23"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-56116.json"
          },
          "ecosystem_specific": {}
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "10.0.7"
                },
                {
                  "fixed": "10.5.2-r0"
                }
              ]
            }
          ],
          "package": {
            "name": "dhcpcd",
            "purl": "pkg:apk/alpine/dhcpcd?arch=source",
            "ecosystem": "Alpine:v3.24"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-56116.json"
          },
          "ecosystem_specific": {}
        }
      ],
      "modified": "2026-10-09T09:30:02.626744424Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-56116"
      ],
      "references": [
        "https://security.alpinelinux.org/vuln/CVE-2026-56116"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-56116",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 111387,
  "published_at": "2026-06-23T17:17:09.41+00:00"
}