buf_init(txid xmin, txid xmax)
{
	TxidSnapshot snap;
	StringInfo	buf;

	snap.xmin = xmin;
	snap.xmax = xmax;
	snap.nxip = 0;

	buf = makeStringInfo();
	appendBinaryStringInfo(buf, (char *) &snap, TXID_SNAPSHOT_SIZE(0));
	return buf;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.