{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55606",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T23:31:22.445Z",
        "datePublished": "2026-10-23T13:21:21.038Z",
        "dateUpdated": "2026-10-29T17:43:41.478Z"
    },
    "containers": {
        "cna": {
            "title": "odhcpd: Stack buffer overread via DUID length endianness mismatch in memcmp()",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-126",
                            "lang": "en",
                            "description": "CWE-126: Buffer Over-read",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "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"
                    }
                }
            ],
            "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"
                }
            ],
            "affected": [
                {
                    "vendor": "openwrt",
                    "product": "odhcpd",
                    "versions": [
                        {
                            "version": "<= 25.12",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-23T13:21:21.038Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. In versions 25.12 and prior, odhcpd's 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 — 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."
                }
            ],
            "source": {
                "advisory": "GHSA-x8x4-7gvf-gp45",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-29T17:43:15.504706Z",
                                "id": "CVE-2026-55606",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-29T17:43:41.478Z"
                }
            }
        ]
    }
}