{"id":"CVE-2026-55606","revision":null,"records":[{"revision":"a60ace69e8644cfd8a39cd1a8e5fbcff","observedAt":"2026-10-23T16:01:20.601+00:00","statement":{"source":"cve-program","id":"CVE-2026-55606","aliases":[],"title":"odhcpd: Stack buffer overread via DUID length endianness mismatch in memcmp()","description":"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.","state":0,"publishedAt":"2026-10-23T13:21:21.038+00:00","modifiedAt":"2026-10-23T13:21:21.038+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 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45","https://github.com/openwrt/odhcpd/pull/401","https://github.com/openwrt/odhcpd/commit/6907f28f9ddeef9f69f5ee10bbc9ba8adc0ef57f","https://github.com/openwrt/odhcpd/commit/ed38cffa927d5fd450d20bfd3f7fb8d8e8fff301"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55606","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55606","identifiers":["CVE-2026-55606"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-28T05:06:15.3984380+00:00","complete":true,"records":1760,"lastAttemptAt":"2026-10-28T05:06:15.398438+00:00","lastSuccessAt":"2026-10-28T05:06:15.7966337+00:00","error":null,"lastVerifiedAt":"2026-10-28T05:06:15.7967555+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-d1db82f9667782a78242c660a30cd6de352d985df66025fc049726d630342332","complete":true,"records":415517,"lastAttemptAt":"2026-10-28T05:06:14.7783385+00:00","lastSuccessAt":"2026-10-28T04:51:28.9455845+00:00","error":null,"lastVerifiedAt":"2026-10-28T05:06:14.7783385+00:00","snapshotPublishedAt":"2026-10-28T04:25:55+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-784961ce4a05421d9e4e38769d827822","complete":false,"records":10691,"lastAttemptAt":"2026-10-28T05:17:48.7100808+00:00","lastSuccessAt":"2026-10-28T05:17:48.706+00:00","error":"18 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-10-28T05:17:48.706+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":5982,"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":"2026-10-28T05:06:15.3984380+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-28T05:06:15.398438+00:00","lastSuccessAt":"2026-10-28T05:06:15.9438631+00:00","error":null,"lastVerifiedAt":"2026-10-28T05:06:15.9438636+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":"2026-10-28T05:06:16.73458+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":"2026-10-28T05:06:15.1305296+00:00","lastSuccessAt":"2026-10-27T21:49:03.9756799+00:00","error":null,"lastVerifiedAt":"2026-10-28T05:06:15.1305296+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":"2026-10-28T05:06:14.8565331+00:00","lastSuccessAt":"2026-10-27T21:46:38.0277323+00:00","error":null,"lastVerifiedAt":"2026-10-28T05:06:14.8565331+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":"2026-10-28T05:06:15.239239+00:00","lastSuccessAt":"2026-10-27T16:45:49.0050993+00:00","error":null,"lastVerifiedAt":"2026-10-28T05:06:15.239239+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":"2026-10-28T05:06:15.0247794+00:00","lastSuccessAt":"2026-10-28T02:53:16.9493663+00:00","error":null,"lastVerifiedAt":"2026-10-28T05:06:15.0247794+00:00","snapshotPublishedAt":"2026-10-28T02:33:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}