CVE-2026-21878 is a path traversal vulnerability in the BACnet Stack C library, affecting versions prior to 1.5.0.rc3. This flaw allows an unauthenticated attacker to write files to arbitrary directories due to a lack of validation on user-provided file paths. With a CVSS score of 7.5 (High), this vulnerability has a low attack complexity and can lead to high integrity impact, though confidentiality and availability are not affected. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
1.5.0CPE matchmatch criteria | cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0:rc1:*:*:*:*:*:* | ||
1.5.0CPE matchmatch criteria | cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0:rc2:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.