Team,

File: /src/leveldb/util/env_posix.cc#L355

  }

  virtual bool FileExists(const std::string& fname) {
    return access(fname.c_str(), F_OK) == 0;
}

I believe this indicates a security flaw, If an attacker can change anything along the path between the call access() and the files actually used, attacker may exploit the race condition or a time-of-check, time-of-use race condition, request team to please have a look and validate.

Reference: https://linux.die.net/man/2/access