{"id":"CVE-2026-64675","summary":"BACnet Stack: Pre-auth OOB read in xy_color_decode (BACnetXYColor) via WriteGroup/WriteProperty","details":"BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.5 and 1.5.1, a single unauthenticated BACnet/IP UDP datagram (port 47808) triggers an out-of-bounds read in xy_color_decode() (src/bacnet/lighting.c), reachable pre-authentication through two default-registered service handlers: the UnconfirmedRequest WriteGroup service (0x0A) and Confirmed WriteProperty on a BACnetXYColor-typed property. This issue has been patched in versions 1.4.5, 1.5.1, and 1.6.0.","aliases":["GHSA-mmg6-p4pr-cj6h"],"modified":"2026-11-15T02:46:52.222696192Z","published":"2026-11-13T18:51:06.844Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64675.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-125"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64675.json"},{"type":"ADVISORY","url":"https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-mmg6-p4pr-cj6h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64675"},{"type":"FIX","url":"https://github.com/bacnet-stack/bacnet-stack/pull/1386"},{"type":"FIX","url":"https://github.com/bacnet-stack/bacnet-stack/pull/1387"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bacnet-stack/bacnet-stack","events":[{"introduced":"0"},{"fixed":"289b90d8d109b00594667a82007255bb71b36a6b"},{"fixed":"3a74c74a8139526e34da32c6cc41ed7c71aaded5"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"0"},{"fixed":"1.4.5"}]},{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"0"},{"fixed":"1.5.1"}]}]}}],"versions":["bacnet-stack-1.4.4","bacnet-stack-1.5.0","bacnet-stack-1.4.3","bacnet-stack-1.4.2","bacnet-stack-1.4.1","bacnet-stack-1.4.0","bacnet-stack-1.3.8","bacnet-stack-1.3.7","bacnet-stack-1.3.6","bacnet-stack-1.3.5","bacnet-stack-1.3.4","bacnet-stack-1.3.3","bacnet-stack-1.3.2","bacnet-stack-1.3.1","bacnet-stack-1.3.0","bacnet-stack-1.2.0","bacnet-stack-1.1.1","bacnet-stack-1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64675.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}