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  4. CVE 2026 46677 bacnet stack client side out of bounds read in
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-46677

BACnet Stack: Client-Side Out-of-Bounds Read in AtomicReadFile-ACK Record-Access Handling via RecordCount / fileData[] MismatchCVE-2026-46677

Answer in brief

CVE-2026-46677 records a Medium severity (CVSS 6.5) vulnerability in BACnet Stack: Client-Side Out-of-Bounds Read in AtomicReadFile-ACK Record-Access Handling via RecordCount / fileData[] Mismatch. The current sources do not mark it as known exploited. The current feed maps bacnet-stack/bacnet-stack (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 12, 2026Updated Nov 12, 2026Source checked Nov 12, 2026First seen by HOL Nov 12, 2026Material review Nov 12, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps bacnet-stack/bacnet-stack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
bacnet-stack/bacnet-stackgeneric<1.4.4 || <1.5.11.4.4, 1.5.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for bacnet-stack/bacnet-stack.
  2. 2Review the reported fix. Update bacnet-stack/bacnet-stack to 1.4.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 12, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4 and 1.5.1, there is a client-side out-of-bounds read in the AtomicReadFile-ACK record-access handling path. The issue is caused by a mismatch between a remote returnedRecordCount value and the fixed local fileData[] array capacity in BACNET_ATOMIC_READ_FILE_DATA. The ACK decode path preserves the remote RecordCount, discards storage for excess records without truncating that count, and a downstream sink later iterates over the original RecordCount and indexes fileData[i] out of bounds. This issue has been patched in versions 1.4.4 and 1.5.1.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Atomic-Read-File RecordCount Stack-Based Out-of-Bounds Write in bacnet-stackSame bacnet-stack/bacnet-stack package
  • BACnet Stack: NULL pointer dereference in bacnet_device_object_reference_decode() when WriteProperty updates Structured View subordinate-listSame bacnet-stack/bacnet-stack package
  • BACnet Stack: Out-of-Bounds Read in AtomicWriteFile Record Decoder via Unbounded returnedRecordCountSame bacnet-stack/bacnet-stack package
  • BACnet Stack: Uninitialized Value Use in AtomicReadFile-ACK Record-Access Encoder Causes Response Corruption and Conditional Information DisclosureSame bacnet-stack/bacnet-stack package
  • BACnet Stack: Channel member self-reference causes uncontrolled recursion and stack overflow in default BACnet/IP serverSame bacnet-stack/bacnet-stack package
  • BACnet Stack: ReinitializeDevice ENDRESTORE can delete existing objects on an empty restore file and still return successSame bacnet-stack/bacnet-stack package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-125, CWE-130
Source
CVE List V5
Source checked
Nov 12, 2026
References
2 linked sources
Open source record