{"id":"CVE-2026-53918","revision":null,"records":[{"revision":"ba26b42074fc4738b4eed00f1afe12dd","observedAt":"2026-10-23T16:01:20.601+00:00","statement":{"source":"cve-program","id":"CVE-2026-53918","aliases":[],"title":"odhcpd DHCPv6 IA dangling first pointer use-after-free","description":"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.","state":0,"publishedAt":"2026-10-23T13:21:00.665+00:00","modifiedAt":"2026-10-23T13:21:00.665+00:00","affected":[{"ecosystem":"Vendor product","name":"odhcpd","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"openwrt\",\n                    \"product\": \"odhcpd\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 25.12\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.8,"severity":"HIGH"}],"references":["https://github.com/openwrt/odhcpd/security/advisories/GHSA-44ff-jcwh-wgc2","https://github.com/openwrt/odhcpd/commit/26b122007030ebf192376aff8f98d428b25e2a93","https://github.com/openwrt/odhcpd/commit/5b283832c0a77aed20f1cc384ffc40bc768b06e9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53918","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53918","identifiers":["CVE-2026-53918"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-28T03:51:33.9437802+00:00","complete":true,"records":1760,"lastAttemptAt":"2026-10-28T03:51:33.9437802+00:00","lastSuccessAt":"2026-10-28T03:51:34.0961236+00:00","error":null,"lastVerifiedAt":"2026-10-28T03:51:34.0961246+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-d2186f400c54d65f61687f78bb1a00d184d2e215877d0194d7ed70caee809a44-5e002664ec8433c1a0afdeba204aeae5ffbe828d6bbdb74ae37529eb2b6b1b6f","complete":true,"records":415510,"lastAttemptAt":"2026-10-28T03:51:32.842736+00:00","lastSuccessAt":"2026-10-28T03:51:32.8041674+00:00","error":null,"lastVerifiedAt":"2026-10-28T03:51:32.842736+00:00","snapshotPublishedAt":"2026-10-28T03:24:13+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-233b167da0484950a642d70fecbb2f8f","complete":false,"records":9694,"lastAttemptAt":"2026-10-28T04:03:09.0504101+00:00","lastSuccessAt":"2026-10-28T04:03:09.046+00:00","error":"18 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-10-28T04:03:09.046+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":4982,"expectedIdentifiers":13514,"failedIdentifiers":18},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-28T03:51:33.9437802+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-28T03:51:33.9437802+00:00","lastSuccessAt":"2026-10-28T03:51:34.0971299+00:00","error":null,"lastVerifiedAt":"2026-10-28T03:51:34.09713+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-8d16a738328646698f9217d8ea11893c","complete":true,"records":13449,"lastAttemptAt":"2026-10-28T03:51:36.4785313+00:00","lastSuccessAt":"2026-10-27T22:48:29.491+00:00","error":null,"lastVerifiedAt":"2026-10-27T22:48:29.491+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13514,"expectedIdentifiers":13514,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-f7cb12508d9e6a348c8a60f772ed85529cc80cd2ff853da1099b57754b20e943","complete":true,"records":9790,"lastAttemptAt":"2026-10-28T03:51:33.4681471+00:00","lastSuccessAt":"2026-10-27T21:49:03.9756799+00:00","error":null,"lastVerifiedAt":"2026-10-28T03:51:33.4681471+00:00","snapshotPublishedAt":"2026-10-27T21:48:11+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-72e5e79de0026dd0562d40734074a2236a06886643d67182b8381eaee757dbf7","complete":true,"records":1966,"lastAttemptAt":"2026-10-28T03:51:32.8879793+00:00","lastSuccessAt":"2026-10-27T21:46:38.0277323+00:00","error":null,"lastVerifiedAt":"2026-10-28T03:51:32.8879793+00:00","snapshotPublishedAt":"2026-10-27T21:18:15+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-3a5b306d60fc44677a03a8afc99d87e6c5402770ef68d560f94a8c3ad3802b75","complete":true,"records":3001,"lastAttemptAt":"2026-10-28T03:51:33.8464162+00:00","lastSuccessAt":"2026-10-27T16:45:49.0050993+00:00","error":null,"lastVerifiedAt":"2026-10-28T03:51:33.8464162+00:00","snapshotPublishedAt":"2026-10-27T16:33:43+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-5f3141cf1b985319fe2c9d9b1b1aab03f442c3a2272590c3c2e44d5d3d31bfb3","complete":true,"records":230854,"lastAttemptAt":"2026-10-28T03:51:33.3608683+00:00","lastSuccessAt":"2026-10-28T02:53:16.9493663+00:00","error":null,"lastVerifiedAt":"2026-10-28T03:51:33.3608683+00:00","snapshotPublishedAt":"2026-10-28T02:33:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}