{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "odhcpd",
          "vendor": "openwrt",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 25.12"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. In versions 25.12 and prior, odhcpd\u0027s DHCPv6 self-loop detection at dhcpv6.c:720 uses a network-byte-order DUID length value directly as the memcmp() size parameter. On little-endian hosts, this causes memcmp() to read far beyond the stack buffer \u2014 a single unauthenticated DHCPv6 packet triggers a 2560-byte overread from a 128-byte buffer. At time of publication, there are no publicly available patches."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-126",
              "description": "CWE-126: Buffer Over-read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T13:21:21.038Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45"
        },
        {
          "name": "https://github.com/openwrt/odhcpd/pull/401",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openwrt/odhcpd/pull/401"
        },
        {
          "name": "https://github.com/openwrt/odhcpd/commit/6907f28f9ddeef9f69f5ee10bbc9ba8adc0ef57f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openwrt/odhcpd/commit/6907f28f9ddeef9f69f5ee10bbc9ba8adc0ef57f"
        },
        {
          "name": "https://github.com/openwrt/odhcpd/commit/ed38cffa927d5fd450d20bfd3f7fb8d8e8fff301",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openwrt/odhcpd/commit/ed38cffa927d5fd450d20bfd3f7fb8d8e8fff301"
        }
      ],
      "source": {
        "advisory": "GHSA-x8x4-7gvf-gp45",
        "discovery": "UNKNOWN"
      },
      "title": "odhcpd: Stack buffer overread via DUID length endianness mismatch in memcmp()"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55606",
    "datePublished": "2026-10-23T13:21:21.038Z",
    "dateReserved": "2026-06-16T23:31:22.445Z",
    "dateUpdated": "2026-10-23T13:21:21.038Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}