Is CVE-2026-47258 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-47258 being exploited in the wild.

How severe is CVE-2026-47258?

High severity, with a CVSS score of 8.2, published 12 November 2026.

Which products and versions are affected?

BACnet Stack prior to 1.4.4, 1.5.1, and 1.6.0.

Is there a fix for CVE-2026-47258?

Yes: fixed in 1.4.4, 1.5.1, 1.6.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-47258 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-47258?

Check whether you run BACnet Stack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-47258: BACnet Stack stack-based buffer overflow in Notification Class AddListElement

CVE-2026-47258 · Severity: high · CVSS 8.2 · Published 2026-11-12

BACnet Stack is a C library implementing the BACnet protocol used in building automation and control systems. A stack-based buffer overflow in the Notification Class object can be triggered by a remote attacker sending a specially crafted AddListElement request with more recipient-list elements than the system can hold, causing the application to crash or potentially execute arbitrary code.

Technologies: BACnet Stack. Vendors: BACnet Stack.

Quick answers

Is CVE-2026-47258 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-47258 being exploited in the wild.
How severe is CVE-2026-47258?: High severity, with a CVSS score of 8.2, published 12 November 2026.
Which products and versions are affected?: BACnet Stack prior to 1.4.4, 1.5.1, and 1.6.0.
Is there a fix for CVE-2026-47258?: Yes: fixed in 1.4.4, 1.5.1, 1.6.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-47258 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-47258?: Check whether you run BACnet Stack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 1.4.4, 1.5.1, 1.6.0

Technical details

A stack-based out-of-bounds write exists in Notification_Class_Add_List_Element() in src/bacnet/basic/object/nc.c when decoding recipient-list elements into a fixed-size stack array (NC_MAX_RECIPIENTS, typically 10 elements). The vulnerable code uses new_element_count as an array index before validating it against the array bounds, allowing an AddListElement request with more than NC_MAX_RECIPIENTS BACNET_DESTINATION elements to overflow the stack buffer. The vulnerability requires notification-class support to be compiled in and the SERVICE_CONFIRMED_ADD_LIST_ELEMENT handler to be registered; exploitation is remote via BACnet protocol.

Affected products

BACnet Stack BACnet Stack prior to 1.4.4, 1.5.1, and 1.6.0

Timeline

2026-07-05: disclosed
2026-05-18: patched
2026-11-12: advisory

References

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