CVE-2026-41475 BACnet Stack: Out-of-Bounds Read in WritePropertyMultiple Decoder via Deprecated Tag Parser

High 8.7 Published 24 Apr 2026 Updated 27 Apr 2026

Unauthenticated remote attackers can read memory or crash embedded BACnet devices via a truncated WritePropertyMultiple request in the BACnet Stack library.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-41475?

CVE-2026-41475 is a high-severity vulnerability in bacnet-stack, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-125

Which versions are affected by CVE-2026-41475?

It affects 1 product.

Products include Bacnetstack Bacnet Stack.

How do I fix CVE-2026-41475?

No fix has been published for CVE-2026-41475 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-41475 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41475 exists.

Sources

Also known as GHSA-cvv4-v3g6-4jmv.