hstoreCheckValLen(size_t len)
{
	if (len > HSTORE_MAX_VALUE_LEN)
		ereport(ERROR,
				(errcode(ERRCODE_STRING_DATA_RIGHT_TRUNCATION),
				 errmsg("string too long for hstore value")));
	return len;
}

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