{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "42202bfb1e6ac51fa995beda8be4d7b654aeee2a"
            },
            {
              "fixed": "d368f3f7836d1c2484c8f839316e5c93e76d4409"
            }
          ],
          "repo": "https://github.com/vda-linux/busybox_mirror",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-122"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29004.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "42202bfb1e6ac51fa995beda8be4d7b654aeee2a"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.",
  "id": "CVE-2026-29004",
  "modified": "2026-07-16T03:31:18.330726705Z",
  "published": "2026-05-04T18:05:18.962Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://busybox.net/"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29004.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30652"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-29004"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29004.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29004"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466526"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409"
    },
    {
      "type": "EVIDENCE",
      "url": "https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS"
}