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High severity8.1NVD Advisory· Published Feb 13, 2026· Updated Jun 17, 2026

CVE-2026-26264

CVE-2026-26264

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.

AI Insight

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Affected products

7
  • Bacnetstack/Bacnet Stack7 versions
    cpe:2.3:a:bacnetstack:bacnet_stack:*:*:*:*:*:*:*:*+ 6 more
    • cpe:2.3:a:bacnetstack:bacnet_stack:*:*:*:*:*:*:*:*range: >=1.4.0,<1.4.3
    • cpe:2.3:a:bacnetstack:bacnet_stack:1.4.3:rc1:*:*:*:*:*:*
    • cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0:rc1:*:*:*:*:*:*
    • cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0:rc2:*:*:*:*:*:*
    • cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0:rc3:*:*:*:*:*:*
    • (no CPE)range: <1.5.0rc4 and <1.4.3rc2
    • (no CPE)range: >= 1.5.0rc1, < 1.5.0rc4

Patches

Vulnerability mechanics

References

2

News mentions

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