CVE-2026-21878 — BACnet Stack Improperly Limits Pathnames to a Restricted Directory
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functi…
Published: 2026-02-13 · CVSS: 7.5 · CVSS 3.1
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7