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CVE-2026-26264

Bacnetstack Bacnet Stack out-of-bounds read

8.1 HIGHPublic exploitEPSS 0.56%
  1. Published13 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

Bacnetstack Bacnet Stack≥ 1.4.0 < 1.4.3 · 1.4.3 · 1.5.0

Remediation

Fixed in
Bacnetstack Bacnet Stack≥ 1.4.3

References

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Frequently asked

Is CVE-2026-26264 being actively exploited?

CVE-2026-26264 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-26264?

CVE-2026-26264 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-26264?

Affected products include Bacnetstack Bacnet Stack.

How do I fix CVE-2026-26264?

Upgrade affected software to a fixed version, for example Bacnetstack Bacnet Stack 1.4.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26264 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.