PT-2026-35077 · Unknown · Bacnet Stack

Published 2026-04-24 · Updated 2026-04-25 · CVE-2026-41502

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions BACnet Stack versions prior to 1.4.3

Description An off-by-one out-of-bounds read exists in the ReadPropertyMultiple service decoder. Unauthenticated remote attackers can read one byte past an allocated buffer boundary by sending a crafted RPM request with a truncated object identifier. The issue occurs in the rpm decode object id() function, which validates that apdu len is less than 5 but subsequently accesses six byte positions (indices 0-5). A 5-byte input satisfies the length check but results in a 1-byte out-of-bounds read, which can cause crashes on embedded devices. This flaw is located in src/bacnet/rpm.c and affects deployments where the ReadPropertyMultiple confirmed service handler is enabled.

Recommendations Update to version 1.4.3. As a temporary workaround, disable the ReadPropertyMultiple confirmed service handler.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

CWE-193

Related Identifiers

CVE-2026-41502

Affected Products

Bacnet Stack

References · 4

• 🔥 https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-7545-3fpx-4xw3 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-41502 · Security Note
• https://twitter.com/CVEnew/status/2047798559941226670 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2047849098137514300 · Twitter Post