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CVE-2026-21878

nvd nist
Published: Feb 13, 2026Modified: Feb 18, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Exploitability: 3.9 / Impact: 3.6
Source: security-advisories@github.com (Secondary)

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.

Affected (2)

Bacnetstack
1 product
Bacnet Stack
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Bacnetstack
Bacnet Stack
Version 1.5.0 rc1
Bacnet Stack
Version 1.5.0 rc2

Related CWEs

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (2)

Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Vendor AdvisoryExploit

Timeline

No history available yet.