CVE-2026-26264
8.1 · HIGHOverview
CVE-2026-26264 is a high-severity vulnerability affecting bacnetstack bacnet_stack. It was published on February 13, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0rc4 and 1.4.3rc2, a malformed WriteProperty request can trigger a length underflow in the BACnet stack, leading to an out‑of‑bounds read and a crash (DoS). The issue is in wp.c within wp_decode_service_request. When decoding the optional priority context tag, the code passes apdu_len - apdu_size to bacnet_unsigned_context_decode without validating that apdu_size <= apdu_len. If a truncated APDU reaches this path, apdu_len - apdu_size underflows, resulting in a large size being used for decoding and an out‑of‑bounds read. This vulnerability is fixed in 1.5.0rc4 and 1.4.3rc2.
Remediation
Check the references section for vendor advisories and patches from bacnetstack. Update bacnet_stack to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| bacnetstack | bacnet_stack | >= 1.4.0, < 1.4.3 | Affected |
Frequently Asked Questions
What is CVE-2026-26264?
CVE-2026-26264 is a high-severity vulnerability affecting bacnetstack bacnet_stack. It was published on February 13, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-26264?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-26264?
Check the references section for vendor advisories and patches from bacnetstack. Update bacnet_stack to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-26264?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-26264 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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