BACNET-STACK · CVE-2026-46676 · Package
NO FIX YET · SEE WHAT TO DO
BACnet Stack is an open source BACnet protocol C library used in embedded building-automation devices. A crafted unauthenticated AtomicReadFile request can corrupt the length and payload boundary of the encoded response, because an uninitialized value is used.
first public Jul 5, 2026 · 1 source
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Systems built on bacnet-stack versions 1.4.0 up to 1.4.4, and 1.5.0 up to 1.5.1, that answer AtomicReadFile requests from the network. Devices that do not expose BACnet to untrusted networks, or that do not handle record-access file reads, are less exposed. The sources do not say how common record-access handling is in shipped products.
Not affected if bacnet-not-exposed, no-record-access-handling
Who cares bacnet, building-automation, c, embedded
grep -ri "bacnet" package.json or your embedded firmware's version string.1.4.4 for the 1.4.x line1.5.1 for the 1.5.x lineBACnet Stack is a BACnet open source protocol stack C library for embedded systems. From versions 1.4.0 to before 1.4.4, and 1.5.0 to before 1.5.1, an uninitialized value use vulnerability in bacnet-stack's AtomicReadFile record-access ACK encoder allows unauthenticated remote attackers to corrupt the encoded OCTET STRING length and payload boundary in network responses by sending a crafted AtomicReadFile request that reaches a successful record-access path. This issue has been patched in versions 1.4.4 and 1.5.1.
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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