# CVE-2026-52789: BACnet Stack: Denial of Service (Infinite Loop) in handler_read_property_multiple via malformed RPM requests

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.5, 1.5.1, and 1.6.0, a Denial of Service (DoS) vulnerability exists in the BACnet stack's ReadPropertyMultiple (RPM) handler. When processing a malformed RPM request packet that lacks the expected closing tags, the function handler_read_property_multiple enters an infinite loop. This issue has been patched in versions 1.4.5, 1.5.1, and 1.6.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- bacnet-stack / bacnet-stack: < 1.4.5 (affected); < 1.5.1 (affected); < 1.6.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-835

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-4rf9-4vgq-5gcw (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/bacnet-stack/bacnet-stack/pull/1374 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-52789; retrieved 2026-11-13; source updated 2026-11-13

Revision: 058ba039900d29da8374c63a276450a51d0b81db55f446d9c720cc6590519612

Canonical: https://y2.dev/cve/CVE-2026-52789

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