{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2026.07"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a897b0498f635654f091bf9f33e9696aa773e886"
            }
          ],
          "repo": "https://github.com/riot-os/riot",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-p3fx-9qcg-jmcf"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125",
      "CWE-191"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49868.json"
  },
  "details": "RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.07, _parse_reply() in sys/net/application_layer/dhcpv6/client.c omits minimum-length validation before passing IA_PD and IA_NA option bodies to sub-option parsers. A malicious or compromised DHCPv6 server can send a REPLY with an option length smaller than the required structure while MODULE_DHCPV6_CLIENT_IA_PD is enabled, causing _parse_ia_pd_option to read past the option body, size_t underflow, and unbounded out-of-bounds heap reads that can crash the device and may expose or corrupt memory. This issue is fixed in version 2026.07.",
  "id": "CVE-2026-49868",
  "modified": "2026-10-17T02:30:42.685611634Z",
  "published": "2026-10-16T16:50:58.750Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49868.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/RIOT-OS/RIOT/commit/c9830dc5f2a9bf97418de4fc7d7167d00a45df17"
    },
    {
      "type": "FIX",
      "url": "https://github.com/RIOT-OS/RIOT/pull/22322"
    },
    {
      "type": "WEB",
      "url": "https://github.com/RIOT-OS/RIOT/releases/tag/2026.07"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-p3fx-9qcg-jmcf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49868"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "RIOT: DHCPv6 client _parse_reply() missing sub-option length check leads to size_t underflow and unbounded OOB heap read"
}