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HIGHCVE-2026-21878Published Modified CNA GitHub_M

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 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.

Metrics

CVSS v3.1
7.5
Severity
HIGH
Fixed in
—
Affected Products
1
Affected packages
  • bacnet-stack / bacnet-stack
    < 1.5.0.rc3
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References