{"affected":[{"product":"bacnet-stack","source":"CNA: GitHub_M","vendor":"bacnet-stack","versions":[{"status":"affected","version":"< 1.4.6"},{"status":"affected","version":">= 1.5.0, < 1.5.2"},{"status":"affected","version":">= 1.6.0, < 1.6.1"}]}],"cveId":"CVE-2026-97692","cwes":["CWE-787"],"description":"BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.6, 1.5.2, and 1.6.1, the BACnet/SC message decoder walks the header-option list by following each option's MORE bit. Nothing rejects a list whose last option still has the MORE bit set, and the decode walk has no upper bound on how many options it processes. A single crafted BVLC-SC frame makes the walk advance one option past the end of the message and read message[message_len], one byte out of bounds. When the bytes after the message carry more MORE-set option markers, the walk keeps going: it runs past the fixed 4-entry option array and writes decoded option fields out of bounds. On the server that decode array is the static global bsc_dm, so the out-of-bounds write lands in adjacent BSS. Both faults are reachable before authentication, from the first frame a peer sends on a BACnet/SC connection, and the bytes that follow the message are the same peer's prior-frame data. This issue has been patched in versions 1.4.6, 1.5.2, 1.6.1, and 1.7.0.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.7,"severity":"high","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H","version":"3.1"}],"modifiedAt":1794595361703,"publishedAt":1794595361703,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-gr74-333w-7wg8"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/bacnet-stack/bacnet-stack/pull/1435"}],"remediation":[],"revision":"704da7dcebdcbfcf5dcc9871bd527e66c4cf70b3c0b9d40fe433736d78a6bdc2","sources":[{"modifiedAt":1794595361703,"name":"CNA: GitHub_M","retrievedAt":1794598281047,"url":"https://www.cve.org/CVERecord?id=CVE-2026-97692"}],"ssvc":null,"status":"published","title":"BACnet Stack: pre-auth out-of-bounds read that escalates to an out-of-bounds write into global memory","updatedAt":1794598281047}