CVE-2026-26264
HighSummary
BACnet Stack to otwartoźródłowa biblioteka protokołu BACnet dla systemów wbudowanych. W wersjach przed 1.5.0rc4 i 1.4.3rc2, źle sformułowane żądanie WriteProperty może spowodować niedobór długości w stosie BACnet, prowadząc do odczytu poza zakresem i awarii (DoS).
Risk Assessment
Wykorzystanie tej podatności może prowadzić do awarii systemu, co może zakłócić działanie usług opartych na BACnet w organizacji.
Recommendation
Zaleca się aktualizację do wersji 1.5.0rc4 lub 1.4.3rc2, aby usunąć tę podatność.
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Original NVD description (English source)
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.