CVE-2026-21878

Description

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.

PUBLISHED Reserved 2026-01-05 | Published 2026-02-13 | Updated 2026-02-13 | Assigner GitHub_M

Problem types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

References

github.com/...-stack/security/advisories/GHSA-p8rx-c26w-545j

github.com/...ommit/c5dc00a77b4bc2550befa67a930b333e299c18f3

cve.org (CVE-2026-21878)

nvd.nist.gov (CVE-2026-21878)

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