bool Cues::LoadCuePoint() const {
 const long long stop = m_start + m_size;

 if (m_pos >= stop)
 return false; // nothing else to do

 if (!Init()) {
    m_pos = stop;
 return false;
 }

 IMkvReader* const pReader = m_pSegment->m_pReader;

 while (m_pos < stop) {
 const long long idpos = m_pos;

 long len;

 const long long id = ReadID(pReader, m_pos, len);
 if (id < 0 || (m_pos + len) > stop)
 return false;

    m_pos += len; // consume ID

 const long long size = ReadUInt(pReader, m_pos, len);
 if (size < 0 || (m_pos + len) > stop)
 return false;

    m_pos += len; // consume Size field
 if ((m_pos + size) > stop)
 return false;

 if (id != 0x3B) { // CuePoint ID
      m_pos += size; // consume payload
 if (m_pos > stop)
 return false;

 continue;
 }

 if (m_preload_count < 1)
 return false;

 CuePoint* const pCP = m_cue_points[m_count];
 if (!pCP || (pCP->GetTimeCode() < 0 && (-pCP->GetTimeCode() != idpos)))
 return false;

 if (!pCP->Load(pReader)) {
      m_pos = stop;
 return false;
 }
 ++m_count;
 --m_preload_count;

    m_pos += size; // consume payload
 if (m_pos > stop)
 return false;

 return true; // yes, we loaded a cue point
 }

 return false; // no, we did not load a cue point
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.