CVE-2026-26264 is a denial-of-service vulnerability affecting the BACnet Stack, an open-source C library for embedded systems, specifically versions prior to 1.5.0rc4 and 1.4.3rc2. A malformed WriteProperty request can trigger a length underflow, leading to an out-of-bounds read and system crash. Rated 8.1 HIGH on CVSS, this vulnerability can be exploited remotely with low attack complexity, potentially causing a complete loss of availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 1.4.0, < 1.4.3CPE matchmatch criteria | cpe:2.3:a:bacnetstack:bacnet_stack:*:*:*:*:*:*:*:* | ||
1.4.3CPE matchmatch criteria | cpe:2.3:a:bacnetstack:bacnet_stack:1.4.3:rc1:*:*:*:*:*:* | ||
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:*:*:*:*:*:* | ||
1.5.0CPE matchmatch criteria | cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0:rc3:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.