Out-of-bounds Read in Bacnet-Stack
CVE-2026-41475
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's WritePropertyMultiple service decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending a truncated WPM request. The vulnerability stems from wpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function, which performs no bounds checking on the input buffer. A crafted BACnet/IP packet with a truncated property payload causes the decoder to read 1-7 bytes past the end of the buffer, leading to crashes or information disclosure on embedded BACnet devices. This vulnerability is fixed in 1.4.3.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Bacnet-Stack — versions >= 1.4.0, < 1.4.3
- Bacnetstack Bacnet Stack — versions 1.5.0
Weakness classification (CWE)
References
- github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-cvv4-v3g6-4jmv (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41475?
- CVE-2026-41475 is a critical-severity vulnerability in Bacnet-Stack, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-04-24.
- How severe is CVE-2026-41475?
- Critical severity. CVSS v3 base score is 9.1 out of 10.