{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53918",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-11T15:46:12.315Z",
        "datePublished": "2026-10-23T13:21:00.665Z",
        "dateUpdated": "2026-10-23T13:21:00.665Z"
    },
    "containers": {
        "cna": {
            "title": "odhcpd DHCPv6 IA dangling first pointer use-after-free",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-416",
                            "lang": "en",
                            "description": "CWE-416: Use After Free",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-672",
                            "lang": "en",
                            "description": "CWE-672: Operation on a Resource after Expiration or Release",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-825",
                            "lang": "en",
                            "description": "CWE-825: Expired Pointer Dereference",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/openwrt/odhcpd/security/advisories/GHSA-44ff-jcwh-wgc2",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/openwrt/odhcpd/security/advisories/GHSA-44ff-jcwh-wgc2"
                },
                {
                    "name": "https://github.com/openwrt/odhcpd/commit/26b122007030ebf192376aff8f98d428b25e2a93",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/openwrt/odhcpd/commit/26b122007030ebf192376aff8f98d428b25e2a93"
                },
                {
                    "name": "https://github.com/openwrt/odhcpd/commit/5b283832c0a77aed20f1cc384ffc40bc768b06e9",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/openwrt/odhcpd/commit/5b283832c0a77aed20f1cc384ffc40bc768b06e9"
                }
            ],
            "affected": [
                {
                    "vendor": "openwrt",
                    "product": "odhcpd",
                    "versions": [
                        {
                            "version": "< 25.12",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-23T13:21:00.665Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. Prior to version 25.12, odhcpd's DHCPv6 IA handler keeps a per-message `first` lease pointer so multiple IA options in one message reuse the same Reconfigure authentication key. A DHCPv6 REQUEST from an adjacent-network client can make the first IA set `first`, then make a later same-IAID IA fail the on-link check and free that same lease, leaving `first` dangling. A following IA in the same packet allocates a new lease and copies `first->key`, producing a 16-byte heap-use-after-free read. ASan confirms the UAF; native tracing shows the packet shape can deterministically reclaim the freed lease as the destination allocation, producing a zeroed Reconfigure key copy. The validated impact is unauthenticated adjacent-network denial of service and DHCPv6 Reconfigure/ForceRenew key confusion. Arbitrary PC control is not proven for this UAF alone. This issue has been patched in version 25.12."
                }
            ],
            "source": {
                "advisory": "GHSA-44ff-jcwh-wgc2",
                "discovery": "UNKNOWN"
            }
        }
    }
}